Production of black printing inks

FIELD: process engineering.

SUBSTANCE: invention relates to production of black printing inks. Proposed method comprises production of carbon black by pyrolysis of hydrocarbon gas stock in mix with the products of combustion of hydrocarbon fuel gas and air combusted in combustion chamber at air excess factor ≈0.7-0.9, tempering of pyrolysis products by demineralised water, cooling in heat exchange and carbon black separation. Produced carbon black is mixed with thin mineral oil to reach 8-10 sPs Larey viscosity of suspension. Ink fluid components are mixed with carbon black suspension. Produced mix is subjected to cavitation in hyper turbulent flow for homogenisation in closed space of straight-flow hydrodynamic cavitator to Larey viscosity of 3-4 sPs.

EFFECT: simplified and intensified process, higher quality of ink, lower power input.

5 cl, 1 dwg, 1 ex

 

The invention relates to a technology for black printing inks used for publishing purposes - letterpress, offset and gravure printing on paper, paints special purpose screen, flexographic, gravure printing on non-absorbent substrates and cardboard.

From the prior art there are several ways to obtain black printing inks. They are based on the operation of the dispersion and uniform distribution of the hard particles wetted pigment (carbon black) in the binding. Quality indicators received black paints depend on the degree of degregoria secondary structures of the pigment and the availability of optimal solvate shells of surface-active substances in the composition of the binding. The number and properties of the pigment determines the type of dispersing equipment and scheme of the technological process of production of paint and its cost.

So, in the manufacture of breaking up paste inks, which include most of offset inks and paints for high and screen printing, the dispersion produced in kracktronik machines and bead mills with dual cooling and steel balls, providing a more effective destruction of solid structure carbon particles. To achieve the necessary degree of milling is required repeatedly clause is omitted paint through kratkotrajno machine. For liquid paints (newspaper, Rotogravure and flexographic printing) used beaded vertical and horizontal mills, ball mills and attritors.

A method of producing a newspaper paints by direct dispersion [eagle N. And., Hubacek E. C., and other Reference technologist-printer, h 5, -M.: Book, 1988, S. 28-29, 61-64, 74-80], taken as a prototype, in which the granulated carbon black from the container through the metering device is fed into the mixer, in which the gear pump is also fed a mixture of liquid components, pre-dosed and mixed together. For high or offset printing conventional granular unmodified carbon black processed by the method of "pseudoplasma", i.e. initially moisten with water with special additives wetting that promotes disaggregation and activitysee its surface, then in the mixer with Z-shaped stirrer administered varnishes and other components of the binder and the long-term mix. The bulk of the separated water is drained, and the remaining is removed by evaporation under vacuum. "Pseudoplastic" is a complex process, which produce large quantities of contaminated water that require treatment prior to discharge to the treatment plant.

The blend of ingredients is served in a bead mill for dispersion and homogenization. According to the scientists pasta-concentrate after one two bead mills passed through kratkotrajno machine and diluted to working viscosity. The finished paint is fed to the packaging or in the storage tank to store up to fill in tanks or containers.

The challenge which seeks the invention is the reduction of the technological cycle of production of printing ink, reducing its cost and improving its consumer properties.

The problem is solved due to the fact that, in the method of obtaining black printing inks, including the production of carbon black, mixing it with a standard low-viscosity mineral oil having a kinematic viscosity 6-35 mm2/s at 40°C, and the homogenization of the resulting mixture with other components of the ink, carbon black produced by pyrolysis of the hydrocarbon gas is a raw material in a mixture with the combustion products of hydrocarbon gas of fuel and air, pre-combusted in the combustion chamber when the value of the excess air factor of ≈0,7...0,9, followed by quenching of the pyrolysis products containing soot, demineralized water, cooling them in the heat exchanger and separation of soot, and homogenization of the mixture obtained soot with low-viscosity mineral oil is carried out by the influence of cavitation in hyperturbulent flow in the closed space of the hydrodynamic flow of Cavit the Torah.

This method of obtaining a core component of black printing ink carbon black in combination with cavitation homogenization allowed to exclude from the process of obtaining black printing inks are expensive and energy-consuming processes using kracktronik machines, bead mills, ball mills, attritors, etc. And the impact force of the cavitation in the mixture of carbon black-oil" within 20-60 seconds, depending on the desired viscosity, produces a product with the desired degree of homogenization. Thus, in addition to purely economic effect, there is a significant acceleration of the process, which also affects the further cheapening of the process of obtaining paint.

Preferably the process of homogenization is carried out at temperatures up to 90°C and pressure up to 2.5 MPa. This process reduces the viscosity of the ink and is more subtle homogenization of its components.

To further enhance the efficiency of the process is preferable to heat the emergent products of the pyrolysis gas to be directed to heating of the gas-air mixture and air before feeding them into the combustion chamber, and heated demineralized water.

Additional savings gives direction formed after separation of the pyrolysis products of the tail gas, containing up to 14% hydrogen and up to 12% carbon monoxide, sIgA the s in hot water and steam boilers.

The invention is described in more detail below using a process flowchart on which:

1 - site purification of natural gas from sulfur compounds, carbon dioxide, mechanical impurities and moisture;

2 - the first heat exchanger;

3 - reactor;

4 - combustion chamber of the reactor;

5 - camera pyrolysis;

6 the cooling chamber of the pyrolysis products;

7 - air compressor with the cleaning unit and the drying air fed to the combustion chamber of the reactor;

8 - second heat exchanger;

9 - the receiving node demineralized water;

10 - the third heat exchanger;

11 - the fourth heat exchanger;

12 - node separation of soot (carbon black) from the gas phase;

13 - silo drive, carbon black;

14 - mixing tank;

15 - the capacity for mineral oil;

16 - pump;

17 is a flow-through hydrodynamic cavitator;

18 - dosing pump;

19 - mixing capacity;

20 - dosing unit.

The proposed method is as follows:

Natural gas serves to node 1 purification from sulfur compounds, mechanical impurities, moisture and carbon dioxide. As sorbent use methyldiethanolamine (MDEA or another, is not inferior to him in sorption and corrosion ability of the sorbent. Natural gas coming out of the purification unit, has a residual content of hydrogen sulfide is not more than 3-5 ppm, and point the dew moisture not below minus 6°C. The residual value of carbon dioxide concentration is not limited. Mechanical impurities are absent.

The purified gas is fed to the heating of the first heat exchanger 2, where it is heated to a temperature of 60÷299°C. thus analyze the content in natural gas of various hydrocarbons, the gas pressure at the entrance to the heater, flow rate and gas temperature. After the first heat exchanger 2, the gas is fed into the combustion chamber 4 of the reactor 3 containing a camera 5 pyrolysis and the cooling chamber 6 of the pyrolysis products. Gas-air fuel mixture is produced due to the discharge of the compressor 7 in the combustion chamber 4 of the air, which is pre-heated to 60÷299°C. in the second heat exchanger 8. The combustion gas-air fuel mixture in the combustion chamber 4 of the reactor 3 at a temperature up to 2050°C provides the necessary conditions to maintain the endothermic pyrolysis of natural gas. The products of pyrolysis, leaving the chamber 5, is cooled from node 9 demineralized water having a temperature of (115-125°C., to a temperature of not more than 300°C and through the fourth heat exchanger 11 serves to node 12 separation of carbon black (soot), where multi-stage gas cleaning carried out sequentially in cyclones, bag filters and electrostatic precipitators. Formed after purification of the pyrolysis products in the process of Cheparinov is of tail gases, containing up to 14% hydrogen and up to 12% carbon monoxide, served on the burning hot water and steam boilers in a special, separate burner [not shown]. Heat from the reactor 3 pyrolysis products from the fourth heat exchanger is directed to the heating of natural gas in the first heat exchanger 2), air (the second heat exchanger 8) and demineralized water (in the third heat exchanger 10). The excess heat of pyrolysis products from the heat exchanger 11 heats the air supplied to the heating of industrial premises in the cold season [not shown].

To create a stock of soot and even feeding it to the mixture collected after separation on node 12 black carbon (soot) is stored in the silo drive 13 in a nitrogen atmosphere. From silo-drive 13 soot sector feeder through the ejector [not shown] served in the mixing tank 14 to the mixing with low-viscosity mineral oil, coming from the vessel 15. The resulting slurry pump 16 serves to homogenization in a flow-through hydrodynamic cavitator 17 (for example, model MHC-40 [THE 3618-001-87692481-2008]). The discharge pressure of the slurry at the inlet in flow-through hydrodynamic cavitator 17 reaches up to 2.5 MPa at the outlet of the cavitator up to 0.18 MPa, the temperature of the suspension to 90°C, the viscosity Lareu input/output cavitator is 8÷10 SDR and 3÷4 SDR, respectively. In asiausa line of the pump 16 from the reservoir 15 metering pump 18 serves a portion of fresh low-viscosity mineral oil for the "fine" adjustment of the solids and achieve the desired viscosity. In the mixing tank 19, equipped with a stirrer and a steam jacket of the dosing unit 20 serves liquid components of paint for mixing with the particulate suspension. If necessary for a more subtle homogenization of the components of the paint and achieve the desired viscosity of the obtained ink from the tank 19 by the pump 16 is again pumped through the flow-through hydrodynamic cavitator 17 and sent to the finished goods warehouse for packing and packing or in special containers. Cavitation processes that occur during the passage of paint through flow-through hydrodynamic cavitator 17, raise the heat and reduce the viscosity of the ink, improve the mixing of its components and provide a high degree of homogeneity of the final product.

The entire process can be managed with standard Central control unit (CPU) [not shown], which is connected to the Internet industrial computer with software that controls the progress and actions of staff. Data on temperature and airflow rates for combustion, natural gas combustion and pyrolysis are passed to the CPU for processing. The ratio of costs of natural gas and air for combustion and gas flow rate on the pyrolysis of control inherent in the PC program. The CPU also receives information about the pressure drop across the filters on the work of C the clones and electrostatic precipitators, transport of carbon black from collections in the silo drive, on the density of the transportation system and the lack of intake air. Separately control the mass flow rate of the paint ingredients and cavitation processes of homogenization. If you need more liquid ink is injected and evenly distribute components that reduce the viscosity. Based on this information, provide the computer control and process control. Formed after the separation process of the products of pyrolysis gases containing up to 14% hydrogen and up to 12% carbon monoxide, is directed to the combustion in the hot water and steam boilers, and during abnormal situations serves for the installation of afterburners and/or discharged into the atmosphere and diffuse the air flow, providing regulatory MAC harmful substances in the nearby sanitary area.

The proposed method of producing printing inks, in comparison with the known, allows to obtain a printing ink with a given technology, rheological and optical properties without performing the processes of mechanical grinding and homogenization of black pigment in various mixing and dispersing devices and apparatus. This saves energy, improves the quality and expanding the range of printing inks, reduced and unified production cycle, reduce the I production costs. Waste products and heat of pyrolysis can be used to generate heat and electricity, which further reduces the cost of production of printing inks.

1. A method of obtaining a black printing ink, comprising the processes of carbon black, mixing it with low-viscosity mineral oil and homogenization of the resulting mixture with other components of the ink, characterized in that the carbon black produced by pyrolysis of the hydrocarbon gas is a raw material in a mixture with the combustion products of hydrocarbon gas of fuel and air, pre-combusted in the combustion chamber when the value of the excess air factor of ≈0.7 to 0.9, followed by quenching of the pyrolysis products of demineralized water, cooling them in the heat exchanger and separation of carbon black, a mixture of soot obtained with the specified low-viscosity mineral oil to obtain a suspension of carbon black with viscosity Lareu 8-10 SDR followed by mixing the liquid components of the ink with a suspension of carbon black and homogenization of the mixture when exposed to cavitation in hyperturbulent flow in the closed space of the flow-through hydrodynamic cavitator to achieve the viscosity of the mixture by Larey 3-4 SDR.

2. The method according to p. 1, wherein the homogenization is carried out at temperatures up to 90°C and pressure up to 2.5 MPa.

3. The method according to any of paragraphs. 1 or 2, characterized in that bitone heat coming products of the pyrolysis gas is directed to heating of the gas-air mixture and air before feeding them into the combustion chamber, and heated demineralized water.

4. The method according to any of paragraphs. 1, 2, characterized in that formed after separation of the pyrolysis products of the tail gases are sent for recycling to generate heat and electricity.

5. The method according to p. 3, characterized in that formed after separation of the pyrolysis products of the tail gases are sent for recycling to generate heat and electricity.



 

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1 ex, 1 dwg

FIELD: chemistry.

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17 cl, 3 dwg, 6 tbl, 6 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of black printing inks. Proposed method comprises production of carbon black by pyrolysis of hydrocarbon gas stock in mix with the products of combustion of hydrocarbon fuel gas and air combusted in combustion chamber at air excess factor ≈0.7-0.9, tempering of pyrolysis products by demineralised water, cooling in heat exchange and carbon black separation. Produced carbon black is mixed with thin mineral oil to reach 8-10 sPs Larey viscosity of suspension. Ink fluid components are mixed with carbon black suspension. Produced mix is subjected to cavitation in hyper turbulent flow for homogenisation in closed space of straight-flow hydrodynamic cavitator to Larey viscosity of 3-4 sPs.

EFFECT: simplified and intensified process, higher quality of ink, lower power input.

5 cl, 1 dwg, 1 ex

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