Preparation of aromatic nitrile compound by waste-free circulation method

A waste liquid circulation and aromatic technology, which is applied in the preparation of carboxylic acid nitrile, organic compound preparation, organic chemistry, etc., can solve the problems of expensive treatment cost, difficult and harmless treatment, etc., achieve good economic benefits and eliminate environmental problems Hazard, consumption reduction effect

Inactive Publication Date: 2007-12-05
成都圣洁环保有限责任公司
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Problems solved by technology

[0006] But above-mentioned three kinds of methods of preparing N-phenylaminoacetonitrile, all fail to propose effective treatment method to the large amount of waste water that produces in the production process
The benzene and cyano substances contained in wastewater are difficult to be effectively and harmlessly treated by conventional physical, chemical and biological methods.
Even if it can be treated to meet environmental emission requirements, its treatment cost is very expensive, resulting in no profit for the production of this product

Method used

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Examples

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example

[0014] Example 2: Add 2 moles of aniline to a 1000 ml three-necked flask equipped with stirring, and after the temperature rises above 100°C, add 316 ml of hydroxyacetonitrile containing 382.5 g / L into the three-necked flask until the addition of hydroxyacetonitrile is complete Afterwards, incubate at 90-120° C. for 150 minutes. After the insulation finishes, transfer the reaction mixture into a 1000-ml separatory funnel and stand still for 10 minutes. Separate the oil phase at the bottom into a container containing 400 milliliters of the previous crystallization mother liquor and 150 milliliters of water. In a 1000 ml three-necked flask, cooled with stirring, crystallized, filtered at 25° C., and air-dried to obtain 266.8 grams of the product, the content of anilinoacetonitrile was 97.6%, and the yield of the product in terms of aniline was 98.86%. Add 0.5 gram of precipitant to water phase and cool to 25 ℃ (afterwards, sediment and product are mixed and crystallized together....

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Abstract

The present invention is no-waste liquid cyclic process for preparing aromatic amino nitrile compound. The cyclic process synthesizes aromatic amino nitrile compound R1-NH-R2-CN by using aromatic amine compound R1-NH2 and hydroxyl alkyl nitrile compound HO-R2-CN as materials and in several combined cyclic systems, and has no waste liquid drainage. The cyclic process has full utilization of materials, saving in resource, high product yield, zero waste liquid drainage and other advantages, and is suitable for use in chemical industry.

Description

Technical field [0001] The invention relates to a method for preparing aromatic aminonitrile compounds without waste liquid circulation, which is suitable for the preparation of aromatic aminonitrile compounds in the chemical industry, especially for wastewater treatment in the manufacturing process of N-phenylaminoacetonitrile. Background technique [0002] The manufacture of N-phenylaminoacetonitrile mainly contains following several methods before the present invention: [0003] The first method uses aniline, formaldehyde and high-purity hydrogen cyanide as raw materials for one-step reaction. In this method, aniline is first added to the reactor and then the other two raw materials are simultaneously fed into the reactor for reaction. Therefore the ratio of raw materials is extremely difficult to control within the specified range, and it is very easy to generate Schiff gangue and secondary substitutes so that the product quality is not high. The yield of the product in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/30C07C255/63
Inventor 孙明
Owner 成都圣洁环保有限责任公司
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