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Method of neutralization of the water combustible solutions of the acetic acid at the automated batching-packing machine

Method of neutralization of the water combustible solutions of the acetic acid at the automated batching-packing machine
IPC classes for russian patent Method of neutralization of the water combustible solutions of the acetic acid at the automated batching-packing machine (RU 2286307):
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FIELD: chemical industry; methods of neutralization of the water combustible solutions of the acetic acids at the computerized batching-packing machine.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method neutralization of the acetic acid and its solutions at leakages and accidents. The method of neutralization of the water combustible solutions of the acetic acids at the computerized batching-packing production line provides for the treatment of the surface, on which there is a leakage of the acetic acid, with the powdery anhydrous sodium carbonate. The treatment of the spilled acetic acid is exercised till formation of the paste and the paste is left on the surface for a while. At the second and the subsequent leakage of the acetic acid on the tray and at formation of the liquid phase the place of the spill is treated with a sodium carbonate till formation of the paste with the purpose for binding the liquid phase. In the case the acetic acid spills on the surfaces located outside of the tray, the neutralization of the acetic acid is exercised by water till gaining the 25-30 % solution. The surface treatment with the powder of the sodium carbonate at the first spill is exercised at the following components ratio (in mass %): Na2CO3:CH3C00H = 1.6÷4.0:1. The invention ensures reduction of the wastes of the production process, allows to reduce emissionof CO2 and allows to diminish toxicity of the production process.

EFFECT: the invention ensures reduction of the wastes of the production process, reduction of emissionof CO2 and reduction toxicity of the production process.

 

The invention relates to the field of chemistry, in particular to neutralize the acetic acid and its solutions when spills and accidents.

Known methods of neutralization of acetic acid or solutions of water 1÷4%-governmental solutions of sodium bicarbonate or water to 2.5÷10%-governmental solutions of sodium hydroxide. (Safety rules and procedure of liquidation of emergency situations involving dangerous goods during their transportation by rail from 25.11.96, No. CM-407, s).

The disadvantage of the methods is a great solution flow rate and, consequently, large amounts of wastewater containing sodium acetate, which must be cleaned before being discharged. In addition, the disadvantage is the release of a large amount of carbon dioxide in the air of working zone and the atmosphere.

The closest in technical essence and the achieved result is a way of neutralization of 70; 80%of the energy of aqueous solutions of acetic acid on filling sealing machine (technical regulations for production and packaging 70; 80%acetic acid №TR 04-50572204-04. - Novosibirsk: LLC "Ibprophen", 2004. - P.10-11).

The spill solution of acetic acid on the pallet and surfaces above the pallet is neutralized with sodium carbonate solution. Is formed in the solution sodium acetate. Complete neutralization of control by the pH.

The disadvantage JV is soba is the presence of large amounts of wastewater with high concentration of sodium acetate, that leads to excretion of sodium acetate required sophisticated technology, including evaporation, crystallization, filtration. The disadvantage of the prototype is also high consumption of powdered sodium carbonate, associated with the fact that sodium carbonate is used in excess. In addition, by neutralizing acetic acid produce large quantities of carbon dioxide released into the air of the working zone and the atmosphere. The disadvantage of this method is the large surface neitralizetu mixture and a negligible temperature increase, which leads to the release of significant quantities of vapor of acetic acid, that is, the toxicity of the process.

Object of the invention is the waste reduction process, reducing costs neutralizing agent, reducing the allocation of CO2and decrease the toxicity of the process.

This object is achieved in that in the method for the elimination of combustible water solution of acetic acid on an automated filling and capping line, including surface treatment, which is poured acid, powdered anhydrous sodium carbonate according to the invention the processing of acid spilled on the tray, leading to the formation of the paste and the paste is removed, the second and subsequent spill of acetic acid on the don in the case of liquid phase add sodium carbonate to form a paste, in case of contact with acetic acid on the surface of the outside of the pallet, the neutralization of the acid carried water to obtain a solution with a concentration of 25÷30 wt.%, moreover, the surface treatment powder sodium carbonate when the first spill of acetic acid is carried out at the following ratio of components:

Na2CO3:CH3COOH=(1,6÷4,0):1.

Automated filling and closing exercise machine filling sealing the modified B3-OD-2-/3-02/03/ on THE other 3-1768. The machine is designed for packing 70; 80%acetic acid under vacuum. Filling and capping machine is a computerized machine rotary type actuator comprising a hopper plastic tubes, carousel filling and sealing. The power of the motor is not more than 2.6 kW. The basic amount of the acid is poured on a stainless steel container, a portion of the acid can get on surfaces outside of the pallet. Neutralization of the acid carried out as follows.

When the first spill acetic acid spill fall asleep 1.6 to 4.0 wt. parts of sodium carbonate per wt. part of the solution of acetic acid to bind all the water contained in the acid solution and is formed in the neutralization process (equation 1), monohydrate sodium carbonate (the level of the s 2):

Excess acid is bound in sodium diacetate (equation 3) and sodium triacetate (equation 4):

The paste is removed in order to neutralize new portions acid during subsequent floods.

Subsequent spills when the liquid phase of the spill site again treated with powder of sodium carbonate to form a paste for bonding the liquid phase. Subsequent spill is the formation of three-hydrate sodium acetate according to equation (5):

In the event of a spill acid on the outside surface of the pallet processing spend the minimum amount of water, for example, from the sprayer to a solution of acetic acid with a concentration of 25÷30%. At such concentrations, the partial vapor pressure of acetic acid is quite low and is 0.8÷1.1 mm RT. Art. (T=20°).

The table shows data about the safe levels for the products of neutralization according to the invention and prototype (the List of codes and substances polluting the atmosphere. - SPb., 2000).

Code The name of the substance Min, mg/m3
3153 Sodium bicarbonate 0,100
0156 Sodium carbonate 0,040
3168 Sodium acetate 0,100
3169 Sodium acetate trihydrate 0,100

The table shows that solid sodium acetate trihydrate and sodium acetate, which is formed on the proposed method of risk comparable with baking soda.

Example 1. When the first spill of 70%acetic acid spilled 171,6 g of acetic acid, which was filled to form a paste with dry sodium carbonate in the amount of 408,7, Got 416,2 g of the monohydrate of sodium carbonate and to 142.1 g of sodium diacetate or 54.6 g of sodium triacetate. Separated respectively 22,0 or 14.7 g of carbon dioxide. The monohydrate of sodium carbonate in the amount of 416,2 g serves as a neutralizing agent in the subsequent spill of acetic acid, and when it is used up completely, subsequent spill fill up powder sodium carbonate.

By neutralizing acid in the prototype used a saturated solution of sodium carbonate and form a solution containing sodium acetate and unreacted sodium carbonate. It stands 44 g of carbon dioxide, which is 2-3 times the amount of CO2obtained according to the invention.

Example 2. When the work machine is tirovannoj filling sealing machine during the shift was released 50 thousand bottles of 70%acetic acid. Broke 90 bottles. The total number of spilled acid was 5,67 kg for the neutralisation of powdered sodium carbonate with the formation of three-hydrate of sodium acetate and triacetate, sodium took 2,532 kg neutralizing agent and stood out 1,051 kg CO2. The total number of solid waste was 7,151 kg by neutralizing the amount of acid in an aqueous solution of carbon sodium would 26,9 DM3solution with a concentration of 13 g/100 cm3and distinguished 1,444 kg CO2.

Example 3. When the automated filling and capping machine during the shift was released 40 thousand bottles of 80%acetic acid. Crashed 72 bottles. The total number of spilled acid was 4,536 kg To neutralize this amount of acid was consumed 2,080 kg of sodium carbonate and the resulting 5,755 kg stagnant paste containing the trihydrate of sodium acetate, sodium diacetate and triacetate sodium. Stood out 0,861 kg of carbon dioxide.

By neutralizing this amount of acid solution of sodium carbonate would 24,64 DM3solution with a concentration of 13 g/100 cm3and distinguished 1,330 kg of carbon dioxide.

Example 4. On an automated filling and capping line was released during the shift 30 thousand bottles 57%acetic acid. Was once the ITA 51 bottle. The total number of spilled acid was 3,213 kg To neutralize the amount of acid required 1,589 kg of sodium carbonate and stood out 0,659 kg of carbon dioxide. Received 4,142 kg of a paste composed mainly of the three-hydrate of sodium acetate. When you neutralize spilled acid with a solution of sodium carbonate would 12,43 DM3solution and distinguished 0,671 kg CO2.

Thus, the proposed method in comparison with the known has the following advantages:

- waste reduction and elimination of technological operations at their disposal;

- reduction neutralizing agent due to the formation of sodium diacetate and sodium triacetate;

- reducing the amount of carbon dioxide released into the air of the working zone and the atmosphere.

- reducing the toxicity of the process due to the spill containment after neutralization with acetic acid, powdered sodium carbonate and increase the speed of neutralization when the temperature in the solid phase.

Method for neutralizing the water-combustible solution of acetic acid on an automated filling and capping line, including surface treatment, which spilled acetic acid, powdered anhydrous sodium carbonate, characterized in that the processing of spilled acid in the FLS to form a paste and the paste is removed, the second and subsequent spill of acetic acid on the pallet when the liquid phase of the spill is treated with sodium carbonate to form a paste, and by ingestion of acetic acid on the surface of the outside of the pallet, the neutralization of acetic acid is carried out with water to get 25-30%-aqueous solution, and processing the surface of a powder of sodium carbonate when the first spill carried out in the following ratio of components by weight: Na2CO3:CH3COOH=1,6-4,0:1.

 

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