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Technique for reclaiming byproduct o-chlorobenzoic acid of o-chlorobenzaldehyde production

A technology of o-chlorobenzoic acid and o-chlorobenzaldehyde is applied in the field of recovery technology of by-product o-chlorobenzoic acid in the production of o-chlorobenzaldehyde, and can solve the problems of high recovery cost, environmental pollution, and difficulty in implementation, and reduce the recovery cost. Effect

Active Publication Date: 2008-07-09
江苏中超新材料科技有限公司
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Problems solved by technology

The production wastewater of o-chlorobenzaldehyde production enterprises, some enterprises sell to small workshops without any sewage treatment facilities to earn illegal income under the condition of seriously polluting the environment, and some enterprises may secretly discharge the sewage when the sewage does not meet the standard. serious pollution of the environment
The problem with this method is that it is difficult to recover the hydrotrope from the complex formed by the hydrotrope and o-chlorobenzoic acid, resulting in high extraction costs
[0005] It has been reported in the literature that the extraction of o-chlorobenzoic acid adopts the dissolution extraction crystallization separation technology of adding a hydrotrope, and the hydrotrope can be sodium butyl monoglycol sulfate [industyial & Engine eying chemisyry reseaych, 1998, 37 (5): 1956-1969 ] or piperazine [chemical Engineering science, 2001, 56: 2335-2346], etc., are difficult to implement due to the high recovery cost

Method used

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  • Technique for reclaiming byproduct o-chlorobenzoic acid of o-chlorobenzaldehyde production

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Embodiment 1

[0016] Process for recovery of by-product o-chlorobenzoic acid in the production of o-chlorobenzaldehyde of the present invention: After the washing water in the production of o-chlorobenzaldehyde is settled for 1h in a 5000L enamel storage tank, a small amount of mechanical impurities in the lower floor are removed, and the water is removed with negative pressure (-0.095MPa) Take 4000L of the solution and pump it into another 5000L enamel reaction kettle, gradually add about 360L of 31% industrial hydrochloric acid dropwise from the industrial hydrochloric acid metering tank (2000L), when the pH value of the solution is 6-7, fully stir for 1-1.5 After h, the o-chlorobenzoic acid in the solution was all separated out, and the solution at that time was an emulsion, and the o-chlorobenzoic acid particles were suspended in the water phase. After centrifugal filtration, 483Kg of o-chlorobenzoic acid filter cake was obtained, and its filter cake contained moisture. About 8%, the cle...

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Abstract

Disclosed is a technique for recycling byproduct of o-chlorobenzoic acid in the production of o-chlorobenzaldehyde, comprising procedures of extracting, centrifugal filtration, refining, twice centrifugal filtration and drying. Employing the invention, purity of products is not less than 99.5%, content of heavy metal is not more than 5PPM, and drying shrinkage is not more than 0.5%, thereby the recycling cost of the o-chlorobenzoic acid is decreased largely. Further, the invention has no pollution because waste water is reused.

Description

technical field [0001] The invention belongs to an energy-saving and environment-friendly recovery process for chemical waste, in particular to a recovery process for by-product o-chlorobenzoic acid in the production of o-chlorobenzaldehyde. Background technique [0002] O-chlorobenzoic acid is an important organic synthesis intermediate and analytical reagent in the fields of dyes, pesticides, and medicine. O-chlorobenzoic acid can be used to prepare drugs such as chlorpromazine, anti-inflammatory spirit, mebendazole, diclofenac, and clotrimazole. It can be used as a standard reagent for measuring method and iodometric method; in addition, it can also be used as adhesive, paint preservative, synthetic dye and color film, etc. [0003] The existing o-chlorobenzoic acid products are mostly produced by oxidation reaction of o-chlorotoluene and liquid oxygen, filtered, and refined. The product demand is stable and the export situation is gratifying, but the cost is relatively h...

Claims

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Application Information

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IPC IPC(8): C07C63/70C07C51/42C07C47/55
Inventor 殷云武薛保安夏建民
Owner 江苏中超新材料科技有限公司
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