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Halide alkylation technique and halide alkylation system for preparation of chloroethane

A process method and technology of ethyl chloride, applied in chemical instruments and methods, disproportionation separation/purification of halogenated hydrocarbons, preparation of halogenated hydrocarbons, etc., can solve the problem of large equipment footprint, limited production scale, low conversion rate of raw materials, etc. problems, to achieve the effect of improving the automation level of the device, improving the utilization rate of ethanol, and reducing the total amount of pollutants

Inactive Publication Date: 2015-05-27
JIANGSU YINZHU CHEM GROUP
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  • Claims
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Problems solved by technology

[0003] The object of the present invention is to use a haloalkane process and system for preparing ethyl chloride, aiming to solve the problem of treating waste liquid existing in the production of ethyl chloride, which causes high cost of pollution control and induces many environmental pollution factors; Reactor is used as the main heating equipment in the production process. There are many unfavorable factors such as low output per unit, low conversion rate of raw materials, and large area occupied by the device, which limit its production scale.

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  • Halide alkylation technique and halide alkylation system for preparation of chloroethane
  • Halide alkylation technique and halide alkylation system for preparation of chloroethane

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] The embodiment of the present invention provides a haloalkane process for preparing ethyl chloride, the haloalkane process for preparing ethyl chloride includes the following steps: using a dedicated ethyl chloride reactor instead of multiple reaction kettles to realize the Large-scale and automatic control to improve the conversion rate of raw materials; according to the difference in gas phase partial pressure of ethanol aqueous solution at different temperatures and the difference in gas phase partial pressure of hydrochloric acid at different temperatures, most of the ethanol and hydrochl...

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Abstract

The invention discloses a halide alkylation technique and a halide alkylation system for preparation of chloroethane. A special chloroethane reactor is used for replacing a plurality of reaction kettles to realize facility upsizing and automatic control and increase the transformation rate of raw materials. According to the difference of gaseous phase partial pressure of ethanol water solution at different temperatures and the difference of gaseous phase partial pressure of hydrochloric acid at different temperatures, most of the ethanol and hydrochloric acid in the reactant mixed gas is distilled and separated and then returned to the chloroethane reactor for reuse; according to the property that organic solvents such as chloroethane and ethanol have different boiling points at different concentrations, a rectification technique is adopted for rectifying and separating chloroethane of which the content satisfies the quality requirement; and according to the property that water has different solubilities in chloroethane at different temperatures, the temperature of chloroethane is reasonably controlled to realize dehydration of chloroethane, and most of the unreacted hydrochloric acid and alcohol in production is recycled and returned to a special reactor for reuse, so that the production cost is lowered, the total amount of pollutant is reduced and good application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a haloalkanization process method and system for preparing ethyl chloride. Background technique [0002] In the process of producing ethyl chloride by halogenation method, the main raw materials are hydrochloric acid and alcohol, zinc chloride solution is used as catalyst, and sulfuric acid, caustic soda, etc. are used as absorbents for chemical purification of products; there are about 15%-20% of the product in the production process Alcohol is absorbed by sulfuric acid, so dilute sulfuric acid containing a large amount of ester and ether organic substances is produced; about 3.0 tons of 30% hydrochloric acid is consumed for each ton of ethyl chloride produced, and about 0.18 tons of chemical water is produced, which will produce about 3.0 tons Dilute hydrochloric acid containing ethanol; neutralization of waste alkali and washing with clean water also prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/043C07C17/38C07C17/16
Inventor 钱怀国徐睿卢爱平
Owner JIANGSU YINZHU CHEM GROUP
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