Method of methanol recovery from gas-vapour mixture at its storage and transshipment

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the method of methanol recovery from gas-vapour mixture at its storage and transhipment and may be used in chemical industry, petrochemical industry, oil and gas producing and processing industries. The method includes extraction of vapours from the gas-vapour mixture in the plant vessel, cooling of the gas-vapour mixture and condensation of vapours in the vapour-condensing unit, condensate return to the vessel and emptying of the vessel. At that cooling of the gas-vapour mixture in the vapour-condensing unit consisting of a vessel for cooled methanol and a packed column installed on it is made to counter-flow interaction of the gas-vapour mixture containing vapours of methanol cooled up to the temperature within the range of minus 25 up to minus 36°C at pressure close to atmosphere pressure when condensed methanol is returned to the vessel for cooled methanol.

EFFECT: method allows increasing quality of storage due to recovery and return of methanol vapours to the vessel.

1 dwg, 1 tbl

 

The invention relates to the production of methanol and can be used in chemical, petrochemical, oil refining and oil and gas industry.

The known method for the preparation of natural gas with methanol obtaining, including the selection of gas under pressure of 5.0-7.0 MPa from the pipeline, then it drossellied to a pressure of 3.0-4.5 MPa, and then select 15-25% of the gas drossellied it up to a pressure of 0.4-1.2 MPa and use the gas as fuel, and the main stream of gas with a pressure of 3.0-4.5 MPa is sent to the heater for heating the gas in the heater. Heated gas bassereau, is subjected to catalytic conversion of obtaining the converted gas, disposed of heat converted gas komprimiert it, carry out the synthesis of methanol circulation unreacted gas and heat recovery last, separating the condensed methanol (patent RU №2404116, IPC SW 3/38, SS 31/04, publ. 20.11.2010).

The disadvantage of this method is the pollution of the environment, as the purification of methanol is due to the combustion and emission in the atmosphere.

The closest in technical essence and the achieved result is a way of returning the vapors in the installation of refueling, including the selection of the vapor gas mixture with pairs of fuel from the tank installation, gas cooling the second mixture and condensation of the fuel vapor in the block condensation of vapours, the return of condensate in the tank and emptying the tank, characterized in that the cooling of the gas mixture in the block condensing vapors produced by evaporation of liquid nitrogen, pairs of which fill the capacity of the installation during its emptying (patent RU №2114051, IPC B67D5/04, B67D5/378, B67D5/54, B67D5/60, B67D5/62, publ. 27.06.1998).

The disadvantage of the prototype is environmental pollution, disturbance ecology, as the cooling of the gas mixture in the block condensing vapors produced by evaporation of liquid nitrogen, pairs of which fill the capacity of the installation when it is emptying, nitrogen gas containing a small amount of fuel vapor, is discharged into the atmosphere through the check valve.

The task of the invention is the improvement of the environment and economy of methanol.

The technical result consists in increasing the quality of storage due to the capture and return of methanol vapor in the container.

The technical result is achieved in that the method of recovery of methanol from the gas-vapor mixture (CBC) during storage and handling includes the selection of vapor calibration gas from the tank installation, cooling the calibration gas and the condensation of vapor in the block of vapor condensation, the condensate return into the tank and emptying the vessel, and cooling the gas mixture in the block condensation of vapours, consisting of a tank of chilled methanol and set the run it Packed columns, produced due to the interaction of counter-current vapor-gas mixture containing vapors of methanol, cooled to a temperature in the range from minus 25 to minus 36°C methanol, at a pressure close to atmospheric, chilled and condensed methanol is returned in the capacity of chilled methanol.

The drawing shows an example of the proposed method, which shows the installation of gas cleaning.

The installation consists of a tank of chilled methanol 1, the Packed column 2, fan 3, 4, pump 5, and 6, the heat exchanger 7, the refrigeration unit 8, spark dispersion 9, filter 10, 11, non-return valves 12, 13, valves 14-19, counter liquid methanol 20.

The method is as follows.

Calibration gas containing methanol vapor pressure of 500 PA, comes from the tank farm storage of methanol through the fans 3, 4 in the capacity of chilled methanol 1. Pressure calibration gas before the fans 3, 4 is controlled and maintained by the bypass part thereof with discharge to the suction side through valve 14. When the pressure ASG to the value 1078 PA crashes reset, via shut-off and control valves 15, candle dispersion 9.

Calibration gas containing methanol vapor pressure of 2000 PA comes with loading racks of methanol in the capacity of chilled methanol 1. In case the repairs install vapor recovery of methanol from the gas mixture, Calibration gas containing methanol vapor, is directed to a candle dispersion 9, this circuit provides isolation valves 15, 16, 17, 18.

The calibration gas mixture containing methanol vapor, occurs in the upper part of the vessel cooled methanol 1 at a pressure close to atmospheric, from which it enters the lower part of the Packed column 2. In the upper part of the Packed column 2, countercurrent, served chilled in the temperature range from minus 25°C to minus 36°C liquid methanol, which acts as a refrigerant. The process of cooling and condensation of the methanol contained in the form of vapor in the gas phase, occurs at contact of chilled methanol with pairs of methanol in the gas phase, thus to increase the area of contact of the phases provided by the nozzle. Condensed from the gas phase methanol is mixed in the nozzle with the refrigerant (methanol supplied to the upper part of the Packed column 2) and flows into a tank of chilled methanol 1. Cooled in the temperature range from minus 19°C to minus 30°C the gas is drained from the upper part of the Packed column 2 through a candle dispersion 9.

The cooling liquid methanol (refrigerant) occurs in the heat exchanger 7 by means of the refrigeration unit 8.

The supply and circulation of liquid methanol (refrigerant) is performed by means of the pumps 5, 6. Piping pumps means: on nagatani the check valves 12, 13, inlet filters 10, 11. When the upper operating level in the tank of chilled methanol 1, opens valves 19 and is pumping the condensed methanol for the production of methanol, which is carried out by means of a counter liquid methanol 20.

The degree of purification of gas-vapor mixture from methanol depending on the temperature range of the refrigerant and the temperature of the exit gas is presented in table No. 1.

Table No. 1
The temperature of the treated gas at the outlet of the Packed column, °CThe residual methanol content in the gas mixture, % (vol.)
The temperature of the refrigerant (methanol), °CThe temperature difference, Δt, °CThe degree of purification of the gas mixture, %
12345
-25-19 698,1901,106
-30-24698,7730,72
-36-30699,2000,47

The method of recovery of methanol from the gas mixture during storage and handling, including the selection of the vapor gas mixture from the tank installation, cooling the gas-vapor mixture and the condensation of vapor in the block of vapor condensation, the condensate return into the tank and emptying the tank, characterized in that the cooling of the gas mixture in the block condensation of vapours, consisting of a tank of chilled methanol and installed the Packed column is produced by the interaction of the counter-current gas-vapor mixture containing vapors of methanol cooled to a temperature in the range from minus 25 to minus 36°C methanol, at a pressure close to atmospheric, chilled and the condensed methanol is returned in the capacity of chilled methanol.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method is realised by a contact of a feeding flow, enriched with hydrogen and carbon monoxide, with a catalyst of methanol synthesis. The obtained in this way technological flow is cooled, condensed and subjected to separation into a gas phase and a liquid phase with raw methanol. As the feeding flow used is synthesis-gas, obtained by steam gasification of charcoal, representing a product of pyrolysis of preliminarily dried wood wastes. Before the contact of the feeding flow with the catalyst, containing in a mole ratio CuO:ZnO:Cr2O3:MnO:MgO:Al2O3:BaO, equal to 1:0.3:(0.15-0.2):(0.05-0.1):(0.05-0.1):(0.25-0.3):0.05 respectively, its compressing to pressure 3.5-4.5 MPa is performed. After that the flow is supplied into a reactor, where a temperature of 250-300°C is supported due to evaporation of recycled water, released from raw methanol, with steam from recycled water from the reactor being directed to charcoal gasification. Cooling of the technological flow is realised conductively from the feeding flow, and condensation is performed by throttling. After separation the gas phase is divided into two flows, one flow is directed for combustion into a pyrolysis chamber, and the second flow is directed to ejection with a ratio of the gas flow to the feeding flow equal to 10:1, respectively.

EFFECT: invention makes it possible to obtain methanol in a waste-free environmentally friendly way without application of additional energy resources.

1 dwg

FIELD: chemistry.

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FIELD: oil and gas industry.

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FIELD: technological processes.

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FIELD: transport.

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20 cl, 4 dwg

Capillary condenser // 2390688

FIELD: heating.

SUBSTANCE: capillary condenser includes housing with upper and lower covers. Between upper and lower covers there arranged are vertical rectangular partitions connected to each other next but one in pairs from below with horizontal straps-bottoms, thus forming steam chambers, and from above they are connected to each other next but one also in pairs with horizontal straps-bottoms, thus forming condensate storage chambers. Each vertical partition consists of several vertical perforated plates arranged with a gap relative to each other and covered with a layer of hydrophilic material or made from it. Holes are made in plates in the form of horizontal conical capillaries located so that small holes of conical capillaries of the preceding plate are located opposite large holes of conical capillaries of the next plate. The plates of vertical partitions face with large holes of conical capillaries the cavity of each steam chamber. The plates of vertical partitions face with small holes of conical capillaries the cavity of each condensate storage chamber.

EFFECT: simplifying the construction, improving operating reliability and efficiency of capillary condenser.

4 dwg

FIELD: waste water treatment.

SUBSTANCE: process comprises following stages: (i) treating waste water by way of evaporation in multi-unit evaporation apparatus to produce vaporous top fraction and liquid bottom fraction containing nonvolatile impurities and (ii) condensing at least part of vaporous top fraction into liquid stream, which is subjected to treatment consisting in distilling off volatile fractions to convert them into top cut containing volatile overflow organic material, and cleaned water in the form of bottom liquid stream.

EFFECT: created cleaned water stream, which can be reused in the process or be subjected to subsequent biological treatment to produce water pure enough to meet all environmental standards for surface water.

9 cl, 3 dwg, 1 tbl

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