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Method for producing methane chloride by using dilute hydrochloric acid

A technology of monochloromethane and dilute hydrochloric acid, applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., to achieve the effect of improving quality, high purity, and less organic impurities

Active Publication Date: 2009-05-27
SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, in order to solve the problems of quality, environmental protection and safety in the process of synthesizing monochloromethane, and reduce the production cost of monochloromethane, the invention provides a kind of production method of high-purity monochloromethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mass ratio is 21.65% dilute hydrochloric acid and 50.63% calcium chloride solution enter hydrochloric acid desorption tower after mixing through mixer, the ratio of calcium chloride solution and dilute hydrochloric acid is 1.65~1.95 (volume ratio), desorption tower top temperature is 96.80°C, the temperature at the bottom of the tower is 123.18°C, and the pressure is 0.09MpaG. Hydrogen chloride gas escapes from the top of the tower, and the calcium chloride solution enters the calcium chloride concentration tank from the bottom of the tower. The moisture is removed at 129.34°C and 0.03MpaG to obtain Wastewater with an acid content of 2.03%. After cooling, condensing, defogging, compression and superheating, the hydrogen chloride gas escaped from the top of the tower enters the reactor equipped with the catalyst with the vaporized and superheated methanol, and reacts at 215°C and 0.18MpaG to form monochloromethane and water. , the high-temperature reaction gas is chilled...

Embodiment 2

[0025] Mass ratio is 18.45% dilute hydrochloric acid and 51.08% calcium chloride solution enter hydrochloric acid desorption tower after mixing through mixer, the ratio of calcium chloride solution and dilute hydrochloric acid is 2.35~2.55 (volume ratio), desorption tower top temperature is 116.70°C, the temperature at the bottom of the tower is 132.71°C, the pressure is 0.17MpaG, hydrogen chloride gas escapes from the top of the tower, and the calcium chloride solution enters the calcium chloride concentration tank from the bottom of the tower. Wastewater with an acid content of 2.66%. After cooling, condensing, defogging, compression and superheating, the hydrogen chloride gas escaped from the top of the tower enters the reactor equipped with the catalyst with the vaporized and superheated methanol, and reacts at 280°C and 0.36MpaG to form monochloromethane and water. , the high-temperature reaction gas is chilled, dried, compressed and condensed to produce monochloromethane...

Embodiment 3

[0028] Mass ratio is 21.84% dilute hydrochloric acid and 50.98% calcium chloride solution enter hydrochloric acid desorption tower after mixing through mixer, the ratio of calcium chloride solution and dilute hydrochloric acid is 2.00~2.25 (volume ratio), desorption tower top temperature is 111.44°C, the temperature at the bottom of the tower is 126.48°C, and the pressure is 0.12MpaG. Hydrogen chloride gas escapes from the top of the tower, and the calcium chloride solution enters the calcium chloride concentration tank from the bottom of the tower. The moisture is removed at 136.50°C and 0.05MpaG to obtain Wastewater with an acid content of 1.88%. After cooling, condensing, defogging, compressing and superheating, the hydrogen chloride gas escaped from the top of the tower enters the reactor equipped with the catalyst with the vaporized and superheated methanol, and reacts at 240°C and 0.20MpaG to form monochloromethane and water. , the high-temperature reaction gas is chille...

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Abstract

The invention provides a method for producing monochloro methane by using dilute hydrochloric acid. The method comprises the following steps: 15 to 22 weight percent of the dilute hydrochloric acid and 40 to 52 percent of calcium chloride solution are mixed in a mixer and then enter into a hydrochloric acid analysis tower, the hydrochloric acid solution breaks a azeotropic point under boiling breaking action of calcium chloride, hydrogen chloride gas escapes from the top of the analysis tower, and the dilute calcium chloride solution is dewatered at a temperature of between 125 and 145 DEGC and a pressure of between 0.02 and 0.1MPa; compressed hydrogen chloride gas and vaporized methanol are superheated by a super-heater and enter a reactor to generate a mixture of monochloro methane, methane, ethyl chloride and methylene chloride; and the generated mixture enters a chilling machine, a gas phase enters a sulphuric acid drying system after the mixture is chilled and separated, and the gas phase is compressed to prepare the monochloro methane. The method effectively solves treatment problem of the dilute hydrochloric acid; the produced hydrogen chloride has high purity and little organic impurity; and the method reduces generating amount of heavy components in subsequent reaction, and improves the quality of the monochloro methane.

Description

technical field [0001] The invention relates to the comprehensive utilization of dilute hydrochloric acid, in particular to a method for producing monochloromethane with dilute hydrochloric acid. Background technique [0002] With the development of the organosilicon industry and the continuous development of downstream products of monochloromethane, the demand for commercial quantities of monochloromethane is increasing, but at this stage most of the production facilities for monochloromethane are only produced as supporting equipment, and the quality of monochloromethane Difficult to meet market requirements. At present, both gas-solid phase catalysis and liquid phase catalysis are used to synthesize monochloromethane. In the production process of gas-solid catalysis, there are the following three production methods: [0003] In a method for preparing monochloromethane disclosed in CN1686981 and a method for producing high-purity monochloromethane disclosed in CN1686983, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/03C07C17/16
Inventor 崔安刚于海涛何树栋
Owner SHANDONG DONGYUE FLUO SILICON MATERIALS CO LTD
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