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Cleaner production method for synthetizing chloromethane

A technology for clean production and methyl chloride, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, disproportionation separation/purification of halogenated hydrocarbons, etc., to achieve the effects of wide pressure range and reduced unit energy consumption

Active Publication Date: 2017-05-31
南通科恩化工技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention mainly proposes a new process method for the problems existing in the existing industrial production of synthesizing monochloromethane, so as to solve some deficiencies in the existing methods, better utilize resources, reduce pollutant discharge, reduce cost and increase efficiency , the specific technical solution is:

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  • Cleaner production method for synthetizing chloromethane

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Embodiment 1

[0075] A clean production method for synthesizing methyl chloride. In this embodiment, both the primary reactor and the secondary reactor are tower reactors, and the shells of both are made of graphite composite carbon fiber material. According to different needs, in other embodiments, the shells of both the primary reactor and the secondary reactor can also be made of steel-lined enamel or steel-composite special engineering plastics.

[0076] The primary reactor and the secondary reactor are equipped with a reaction zone and a washing zone from bottom to top, wherein the reaction zone is divided into a bubbling reaction zone and a gas phase reaction zone, and the gas phase reaction zone is above the bubbling reaction zone , A gas distributor is installed in the bubbling reaction zone, and a washing liquid distributor is installed above the washing zone. In this embodiment, the gas distributor is made of graphite material, and an atomizing nozzle is installed on the gas distr...

Embodiment 2

[0099] This embodiment is basically the same as the embodiment, the difference is that

[0100] 1) Methyl chloride synthesis steps:

[0101] 1.1 Gas-phase hydrogen chloride with a pressure of 0.5MPa and gas-phase methanol with a pressure of 0.5MPa enter the bubbling reaction zone of the primary reactor through the gas distributor of the primary reactor at a molar ratio of 1.2:1, and then pass through the primary reactor The gas phase reaction zone continues to react, the outlet gas velocity of the gas distributor of the primary reactor is 5-10m / s, the catalyst aqueous solution in the primary reactor is zinc chloride aqueous solution, and the reaction of the raw material mixed gas in the primary reactor The reaction time of the zone is kept at 40-45s.

[0102] The reaction temperature in the reaction zone of the primary reactor is 155°C, the reaction pressure is 0.4MPa, and the primary crude CH at the outlet of the primary reactor 3 The volume content of HCl in the Cl mixed g...

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Abstract

The present invention discloses a cleaner production method for synthetizing chloromethane. The method comprises the steps: 1), synthetizing chloromethane: synthetizing crude chloromethane from gas-phase hydrogen chloride and gas-phase methanol; 2), recovering waste heat: performing heat exchange on the crude chloromethane by a heat exchange device and liquid methanol, cooling and discharging, wherein liquid methanol is heated by the heat exchange device to form gas-phase methanol which enters the step 1) as a raw material to react; 3), deacidifying by a deacidifying tower: deacidifying the crude chloromethane; 4), refining in an absorption tower; 5), pressurizing, extracting, rectifying and removing ether; and 6) performing diluted acid solution membrane concentration. In the method, the pressure application ranges of the hydrogen chloride and the methanol are relatively wide, and the content of HCl in diluted acid solution is greatly reduced; the methanol is used as a washing solution, other secondary wastes can not be generated; raw materials, such as the methanol and HCl, are utilized to the greatest extent; the unit energy consumption of CH3Cl is greatly reduced, the unit energy consumption of a product, namely CH3Cl is reduced by more than 20% compared with that in an industrialized unit in the prior art.

Description

technical field [0001] The invention relates to the field of chemical industry and relates to a clean production method for synthesizing methyl chloride. Background technique [0002] Chloromethane, also known as monochloromethane, is an important raw material for organic synthesis, mainly used to produce organosilicon compounds - methyl chlorosilane, and methyl cellulose; it is also widely used as solvent, extractant, propellant, refrigerant , local anesthetics, methylating reagents, and used in the production of pesticides, medicines, spices, etc. [0003] There are many production methods of methyl chloride, including methane chlorination, methanol chlorination, photochlorination, oxychlorination and so on. Some industrial processes also produce chloromethane by-products, such as the production process of trichlorfon, chloral, natural gas chlorination to carbon tetrachloride and phosphamide. The mainstream synthesis process in current industrial production has the follo...

Claims

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Application Information

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IPC IPC(8): C07C17/16C07C17/38C07C19/03
CPCC07C17/16C07C17/38C07C19/03
Inventor 严加高潘成军俞富民朱恩俊
Owner 南通科恩化工技术有限公司
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