The method of disposal of the nitrile of acrylic acid in the gas emissions

 

(57) Abstract:

The invention is intended for neutralization of the nitrile of acrylic acid in the gas emissions. The method consists in the fact that the nitrile of acrylic acid neutralized in two stages: first, the exhaust gases are passed through aqueous suspension of microorganisms Rhodococcus rhodochrous strain M8 or m, and then through the contact device with a nozzle, irrigated with the same suspension. The use of the present invention can effectively clean the exhaust gases from the nitrile of acrylic acid without the use of intensive hydrodynamic modes of operation of the apparatus at a sufficiently low initial concentrations of Acrylonitrile. table 2., 2 Il.

The invention relates to methods of neutralization of the nitrile of acrylic acid (EAA) in the gas emissions of the production.

There are three main approaches to neutralization NAC: catalytic, sorption and chemical [1]. According to the first NAC catalytically oxidized on the catalyst at high temperature, which is the main disadvantage of this method. On the second NAC is absorbed by the activated carbon, while there has been a significant reduction in efficiency at low concentrations of NAC in gases, in addition, requires the m scale.

There is a method of treatment of NAC gas emissions by absorption of water, which is taken as a prototype (Lame B. S., Agrees F. I. the Development of an optimal method of neutralizing free nitrile of acrylic acid //journal "Production and use of elastomers", 1992, No. 11, pages 3 - 10). The purification scheme in this way provides for the existence of a contact apparatus flow type (column with nozzle), in the upper part of which is water, and the bottom receives exhaust gases containing NAC. In the mass transfer processes NAC is absorbed by the water and the water is then disposed of. The scheme shown in Fig. 1.

The modes of this type columns are given in table. 1.

The disadvantages of this method of neutralization include significant water consumption for absorption, especially at lower concentrations of NAA in the exhaust gases, reducing the treatment efficiency at low water. These shortcomings do not allow a wide use of this method on an industrial scale.

Thus, the object of the invention is to increase the efficiency of neutralization of the NAC, while relatively non-intensive hydrodynamic modes of operation devices.

Put ass is e NAC of gases with an aqueous suspension of a strain of microorganism Rhodococcus rhodochtous M8 or M33 with a concentration of 0.3% by weight of dry cells, second - the final destruction of NAC by absorption of the same suspension in a special absorber filled cap.

The proposed solution is based on what is known to be an effective use for the production of acrylamide by hydration NAC of the above strains (application N 96-100024/13 from 16.01.96 g, Russia, MKI C 12 P 13/02). These microorganisms have proven effective in the neutralization of NAC in the gas emissions.

Scheme of the process according to the invention is shown in Fig. 2.

At the first stage of cleaning exhaust gases containing NAC comes in hydraulic lock 4 filled with an aqueous suspension of a strain of microorganism Rhodococcus rhodochrous M8 or M33 with a concentration of 0.3% by weight of dry cells, the second stage of the process exhaust gases are fed into the absorber 1 (contact apparatus) filled with a nozzle in the form of Raschig rings or highly porous cellular material with a developed surface (Antsiferov C. N., Morozova C. E. highly porous aluminosilicate materials: synthesis, properties, application.//Perm, PSTU, 1995.), irrigated with the same suspension circulating in the apparatus through the tank 2. After passing through the described system, empty the contents of NAC in gases is not more than the MAC values for the extracted water NAC undergoes biocatalytic hydration under the effect of said strain, turning into less volatile and more water soluble acrylamide.

After 8 hours of continuous operation of the suspension system from the trap and absorber containing acrylamide, substituted for fresh and waste (through capacity 3) use as raw material in the production of 6 - 12% polyacrylamide gel.

Modes two-stage purification system according to the invention are presented in table.2.

A comparison of the data table. 1 and 2 shows that when the same concentration of NAC in the exhaust gases, the method according to the invention can operate at much higher loads on the gas and light the hydrodynamic modes at the effectiveness of providing the required degree of purification.

Thus, this invention allows to purify exhaust gases acrylic production from NAC relatively simple and cost method. The proposed solution is confirmed and implemented on an industrial scale plant them. S. M. Kirov in the production of low and highly concentrated solutions of acrylamide on biotechnology.

Literature

1. Lame B. S., Agrees F. I. the Development of an optimal method of neutralizing free nitrile of acrylic acid // journal "About the saints aluminosilicate materials: production, properties, application.// Perm, PSTU, 1995.

The method of disposal of the nitrile of acrylic acid in the gas emission absorption method gas-liquid contact apparatus, filled with the nozzle, wherein the gas is cleaned using an aqueous suspension of microorganisms Phodococcus rhodochrous strain M8 or m in two stages: first, the gas is passed through a water seal, filled with the specified suspension, then through the contact device with a nozzle, irrigated with the same suspension.

 

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