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Environment-friendly production method for preparing paratoluenesulfonic acid sodium salt from waste sulfuric acid

A technology of sodium p-toluenesulfonate and p-toluenesulfonic acid, which is applied in the direction of sulfonic acid preparation, sulfonate preparation, chemical instruments and methods, etc., can solve the problem of difficult disposal of waste sulfuric acid, and achieve low production cost and great innovation , The effect of simple process equipment

Inactive Publication Date: 2017-05-31
四川省中明环境治理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an environmentally friendly production method for preparing sodium p-toluenesulfonate from waste sulfuric acid in view of the problems in the prior art, which not only solves the problem that waste sulfuric acid is difficult to handle, but also recycles waste sulfuric acid to prepare p-toluenesulfonic acid sodium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The waste sulfuric acid of the present embodiment prepares the environment-friendly production method of sodium p-toluenesulfonate, comprises the following steps:

[0023] (1) In the 500 milliliter there-necked flask that thermometer, azeotropic rectification condensing tube, dropping funnel are installed, add the hydrochloric acid dehydration of content 45% and produce 217.8 parts of the waste sulfuric acid that produces after the dehydration of hydrochloric acid, be concentrated to content 75%, remaining About 131 parts; at 110°C, add 117 parts of toluene with a content of 99% dropwise under stirring, and the dropping time is 1.5 hours; after the dropwise addition, keep reflux at 110°C and simultaneously separate the water from the drain of the oil-water separator , the toluene was refluxed in the there-necked flask; when the water-dividing volume reached 45 milliliters, the reaction ended, and the reaction time was 6 hours; continue to heat, distill and recover excess...

Embodiment 2

[0027] The waste sulfuric acid of the present embodiment prepares the environment-friendly production method of sodium p-toluenesulfonate, comprises the following steps:

[0028] (1) feed intake is the same as embodiment 1, 45.5 milliliters of water points, 5.5 hours of reaction times; Reclaim 24.8 grams of toluene, content 96.1%;

[0029] (2) The reaction system is cooled to 80° C., the mother liquor of Example 1 is added, and under stirring, it is neutralized to PH=8 with a 30% aqueous sodium hydroxide solution with a concentration of 30% by weight, and the aqueous sodium hydroxide consumption is 144 grams, and the follow-up operation is the same Embodiment 1;

[0030] (3) Operations such as activated carbon decolorization and crystallization are the same as in Example 1 to obtain 226.1 grams of sodium p-toluenesulfonate, with an active content of 79.1%, and a yield of 92.2%; 73 grams of mother liquor, with an active content of 40.8%, and a converted yield of 15.4%.

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Abstract

The invention discloses an environment-friendly production method for preparing paratoluenesulfonic acid sodium salt from waste sulfuric acid. The environment-friendly production method comprises the following steps: (1) concentrating the waste sulfuric acid until weight percentage concentration of the sulfuric acid is greater than 70%, and adding methylbenzene into the sulfuric acid in a weight ratio of (1.2 to 2.0) : 1, and heating to 100-160 DEG C to react, thereby obtaining p-toluenesulfonic acid; (2) enabling a solution containing the p-toluenesulfonic acid to perform neutral reaction with a sodium hydroxide aqueous solution, thereby obtaining paratoluenesulfonic acid sodium; and (3) discoloring the solution containing paratoluenesulfonic acid sodium through active carbon, performing crystal separation, and drying to obtain a paratoluenesulfonic acid sodium product. The environment-friendly production method is used to solve the problem that the waste sulfuric acid is difficult to treat and provide a new idea for a paratoluenesulfonic acid sodium preparation process, and has great innovativeness and common applicability for a preparation process for the paratoluenesulfonic acid sodium salt.

Description

technical field [0001] The invention relates to a process for recycling waste sulfuric acid, which belongs to the field of environmental protection, in particular to an environmentally friendly production method for preparing sodium p-toluenesulfonate from waste sulfuric acid. Background technique [0002] Sulfuric acid is used in all aspects of industrial production. While utilizing it, a large amount of waste sulfuric acid is produced. Waste sulfuric acid has long been a major problem in the chemical industry. [0003] If the country's environmental protection policies and precursor chemicals management regulations are strictly followed, many domestic enterprises that produce waste sulfuric acid will be shut down. Since there are countless waste sulfuric acid products, which are used in all walks of life in the national economy, once the production is stopped, the impact will be immeasurable. Therefore, the recycling of waste sulfuric acid is becoming more and more importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/06C07C303/32C07C303/44C07C309/30
CPCC07C303/06C07C303/32C07C303/44C07C309/30
Inventor 王力立刁正坤刘萍徐晓江
Owner 四川省中明环境治理有限公司
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