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Lossless drying method for natural gas and circulation reaction gas in production of chloromethane with methane method

A technology of cyclic reaction and drying method, which is applied in separation methods, chemical instruments and methods, gas fuels, etc., and can solve problems such as no treatment plan

Active Publication Date: 2019-09-17
ZHEJIANG TIANCAIYUNJI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Regarding the systematic moisture accumulation and the corresponding accumulation of other inert impurity components caused by the methane cycle reaction gas in the production process of the aforementioned methane method to prepare methyl chloride (CMS), there is neither a corresponding treatment plan nor an effective drying method. The method enables the reaction cycle gas to be dried and avoids the problem of methane waste caused by drying. The cycle reaction gas is subjected to a non-destructive drying and dehydration, and at the same time, the function of drying and dehydration of the front-end methane raw material gas is included, so that the system Dry dehydration is more economical and reasonable, and the methane in the system is not lost during drying

Method used

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  • Lossless drying method for natural gas and circulation reaction gas in production of chloromethane with methane method
  • Lossless drying method for natural gas and circulation reaction gas in production of chloromethane with methane method
  • Lossless drying method for natural gas and circulation reaction gas in production of chloromethane with methane method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a non-destructive drying method for natural gas and circulating reaction gas in the methane process for producing chloromethane comprises the following steps:

[0044] (1) Gas-liquid separator 1, which comes from the dehydrogenated natural gas required for the methane chlorination reaction and the circulating reaction gas formed by the methane chlorination reaction, with a temperature of 20~40°C and a pressure of 0.8~1.0MPa, Enter the gas-liquid separator 1, a small amount of water and water-soluble liquid flow out from the bottom, and the gas flows out from the top as raw material gas, hereinafter referred to as "moisture", its water content is 500~700ppm, water-soluble organic volatiles are about 200ppm, and nitrogen gas is 2.4 %(v), methane 97.6%(v), and the rest are trace amounts of carbon monoxide, carbon dioxide, oxygen, argon, helium, etc., with a flow rate of 6,560Nm3 / h, entering the subsequent process, that is, the adsorption step;

...

Embodiment 2

[0050] Based on Example 1, such as figure 2 As shown, the raw material gas directly comes from the natural gas required for the methane chlorination reaction, that is, the natural gas without dehydrogenation purification treatment, and the circulating reaction gas formed by the methane chlorination reaction, the pressure is less than 0.3MPa, no need to pressurize , directly transported by blower into the non-destructive drying system of the front-end natural gas and circulating reaction gas for circulation operation, the adsorption operation temperature of each adsorption tower in the system is 20~30°C, the adsorption operation pressure is less than 0.3MPa, and the thermal regeneration operation temperature The temperature is 200~220℃, the operating pressure is less than 0.3MPa, the cold regeneration operating temperature is 20~30℃, and the operating pressure is less than 0.3MPa; the dry gas flowing out of the non-destructive drying system has a water content of less than or e...

Embodiment 3

[0052] Based on Examples 1 and 2, such as image 3 As shown, the hot regeneration carrier gas (hot blowing gas) comes from the desorption gas of the natural gas PSA dehydrocarbon purification treatment after the non-destructive drying system, that is, the desorption gas of this process is heated to 200~220 by the heater E °C, it is used as the thermal regeneration carrier gas to perform thermal regeneration on the adsorption tower A after the adsorption step is completed. The regeneration waste gas is cooled to 20~30 °C by the cooler F and enters the gas-liquid separator 2 for gas-liquid separation. Water and water-soluble liquid The cooled gas flowing out from the top is returned to the subsequent natural gas to continue dehydrogenation purification treatment and methane recovery; after the thermal regeneration of the adsorption tower A is completed, the dry gas, that is, the product gas, is used as the cold regeneration carrier gas. The bottom of the adsorption tower A in th...

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Abstract

The invention discloses a lossless drying method for a natural gas and a circulation reaction gas in production of chloromethane with a methane method. The lossless drying method comprise the following main steps: feeding a wet gas formed by a raw material natural gas and a circulation reaction gas needed in production of chloromethane (CMS) with a methane method through a gas-liquid separator 1, carrying out adsorption, heating and thermal regeneration and cooling and cold regeneration, and feeding the wet gas through a gas-liquid separator 2. Under conditions that the adsorption operation temperature is 10-60 DEG C, the adsorption operation pressure is 0.3-1.5MPa, the operation temperature of thermal regeneration is 120-220 DEG C, and the operation pressure is 0.3-1.5MPa, moisture in the wet gas is removed to be smaller than 10ppm, both a thermal regeneration carrier gas and a cold regeneration carrier gas are desorption gases generated in dealkylation purification treatment of the raw material natural gas used in production of the CMS with the methane method, the effective component methane in the wet gas is not lost, and a thermal regeneration waste gas and a cold regeneration waste gas are fed back to a dealkylation purification treatment procedure of the raw material natural gas or / and fed back to a drying system for circulation.

Description

technical field [0001] The invention relates to the field of adsorption drying and dehydration of natural gas and circulating reaction gas in the process of preparing methyl chloride series products by a methane method in fine chemical industry, and more specifically relates to a non-destructive drying method for natural gas and circulating reaction gas in the production of methyl chloride by methane method. Background technique [0002] Chloromethane (CMS) is a widely used basic chemical raw material and product, including monochloromethane, dichloromethane, chloroform and tetrachloromethane, mainly used in organic silicon, methyl cellulose, tetramethyl lead, Production of herbicides, butyl rubber, organic solvents, organic synthetic materials and refrigerants, etc. The production processes mainly include methanol method and methane method. The methane method mainly uses natural gas as a raw material, and under certain conditions, it reacts with chlorine to generate CMS. ...

Claims

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Application Information

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IPC IPC(8): B01D53/26B01D53/02C10L3/10
CPCB01D53/261B01D2259/40086B01D2259/4009C10L3/106
Inventor 唐金财汪兰海陈运钟娅玲钟雨明蔡跃明
Owner ZHEJIANG TIANCAIYUNJI TECH CO LTD
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