A kind of treatment method of thionyl chloride tail gas

A technology of thionyl chloride and treatment method, which is applied in the field of treatment of thionyl chloride tail gas, can solve the problems of secondary pollution, large equipment investment, and low added value of by-products, and achieve no secondary pollution and high treatment efficiency , the effect of low operating cost

Active Publication Date: 2021-06-08
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can make the exhaust gas meet the emission standards, there are problems of large equipment investment and high operation and maintenance costs, and the absorbent cannot be recycled, resulting in a large waste of resources. At the same time, the obtained by-products have low added value and are not easy to sell. Easy to cause secondary pollution
[0010] Chinese patent CN101607173A proposes to obtain magnesium sulfite for flue gas desulfurization through external recycling of magnesium oxide and magnesium bisulfite, but this method still needs to supplement magnesium oxide, and at the same time continuously generates magnesium bisulfite, which fails to truly realize the recycling of absorbents , and the final product also has resource waste and secondary pollution problems
U.S. Patent US4366134 and Chinese Patent CN200410073471 adopt the citric acid / sodium citrate method, and the absorption solvent used can be regenerated, but there is corrosion to metal equipment during use, and some heat-stable salts containing sulfate radicals are formed

Method used

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  • A kind of treatment method of thionyl chloride tail gas
  • A kind of treatment method of thionyl chloride tail gas
  • A kind of treatment method of thionyl chloride tail gas

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preparation example Construction

[0041] Wherein the preparation method of organic amine absorbent (I), its steps are as follows:

[0042] First, add paraformaldehyde and L-phenylglycinol in THF, heat up and reflux for 8-12h, and obtain compound (I);

[0043] Secondly, the product can be obtained by distilling and recovering the dry solvent. The synthetic route is as follows:

[0044]

[0045] Wherein the reflux temperature of THF is 60-65 ℃, and the molar weight of described paraformaldehyde converted into formaldehyde is 1.5 times of the molar weight of L-phenylglycinol, and described paraformaldehyde [HO (CH O) nH, wherein n is Polymerization degree, n=10~100].

[0046] The content of sulfur dioxide in the alcohol solution is determined by direct iodometric method (see GB / T11198.12-1989); the content of sulfur dioxide in the tail gas is determined by iodometric method according to the standard HJ / T56-2000 of the State Environmental Protection Administration.

Embodiment 1

[0048] The tail gas produced by the reaction of one mole of thionyl chloride with alcoholic hydroxyl groups is subjected to secondary absorption by ethanol solution, and then the sulfur dioxide tail gas that is basically free of hydrogen chloride is passed into 350 grams of organic amine absorbent I to absorb at 30°C and then discharged. The waste gas is discharged according to the country Sulfur dioxide content is 5mg / m3 when tested according to the standard HJ / T56-2000 of the State Environmental Protection Administration 3 (to meet the emission requirements of the State Environmental Protection Administration). Then the absorption liquid is heated and desorbed at 130°C for 1 hour, and the obtained absorbent can be recycled, and the released sulfur dioxide can be further processed.

Embodiment 2

[0050]The tail gas produced by the reaction of one mole of thionyl chloride with the hydroxyl group of the alcohol is absorbed by the secondary alcohol and the sulfur dioxide tail gas is removed from the hydrogen chloride. After being collected by the gas collection hood and pressurized by the fan, it is sprayed at 20-25 ° C. The absorbent and tail gas are fully contacted in the packed tower. After the absorption reaction is completed, the purified gas is discharged from the top of the absorption tower; the solution (rich liquid) after absorbing sulfur dioxide is drawn from the bottom of the absorption tower and enters the upper part of the regeneration tower for regeneration. The sulfur dioxide gas released by thermal desorption is sent to the next process for treatment, and the absorbent is recycled.

[0051] The treated purified gas is tested according to the method of the State Environmental Protection Administration standard HJ / T56-2000, and the sulfur dioxide content is 2...

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Abstract

The invention provides a method for treating the tail gas of thionyl chloride, which comprises the following steps: the first step is to perform secondary absorption of hydrogen chloride in the tail gas by controlling the amount of alcohol; the second step is to use an organic amine absorbent to absorb sulfur dioxide; In the third step, after the absorption is complete, the nearly saturated absorption solution is heated and desorbed at 130-150°C to regenerate SO2 with a purity of more than 95%, and the organic amine absorption solvent can be recycled, and the tail gas meets the standard discharge; it also involves a manufacturing Method for Organic Amine Absorbent (I). The invention converts the hydrogen chloride gas in the tail gas into the industrially usable hydrogen chloride alcohol solution as much as possible, and provides a recyclable sulfur dioxide absorbent.

Description

technical field [0001] The invention relates to a treatment method for thionyl chloride tail gas. Background technique [0002] As a basic chemical raw material, thionyl chloride is widely used in chlorination reactions, such as chlorinating alcohol hydroxyl groups into chlorinated alkanes or chlorinating carboxylic acids into acid chlorides, etc. It has the advantages of complete chlorination and less side reactions. The obtained by-products are all volatile gases, so the obtained acid chloride products are easy to purify. The biggest problem with the use of thionyl chloride in production is the treatment of its reaction tail gas. Every mole of thionyl chloride that normally participates in the chlorination reaction will produce one mole of hydrogen chloride and one mole of sulfur dioxide. The reaction formula is as follows: [0003] R-OH+SOCl 2 → R-Cl + HCl + SO 2 [0004] Two moles of hydrogen chloride and one mole of sulfur dioxide are produced per mole of thionyl ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1406B01D53/1418B01D53/1425B01D53/1456B01D53/1481B01D2252/202B01D2252/2041B01D2257/2045B01D2258/02
Inventor 沈润溥董华平陈斌盛国栋刘伟高晓忠徐慧婷宋小华
Owner SHAOXING UNIVERSITY
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