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A method for recovering h2s and nh3 in acidic water and purifying acidic water

A sour water and acid gas technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of complex process, long start-up time, high energy consumption, etc., and achieve the effect of complete separation

Active Publication Date: 2019-06-07
SYNEFUELS CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is easy to control in operation, but the process is complicated, the energy consumption is high, and the start-up time is long

Method used

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  • A method for recovering h2s and nh3 in acidic water and purifying acidic water
  • A method for recovering h2s and nh3 in acidic water and purifying acidic water
  • A method for recovering h2s and nh3 in acidic water and purifying acidic water

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Embodiment 1

[0048] 1) According to figure 1 In the process shown, the acidic water to be purified (stream 101) from devices such as purification transformation, tail gas hydrogen production, low-temperature methanol washing, sulfur recovery and oil processing enters the degassing tank 1 together, and is operated at 47°C and 0.22MPa Perform flash evaporation under conditions to obtain flash gas and acidic water I; wherein, the flash gas obtained at the top of the tank enters the carbon dioxide stripping tower top condenser; the acidic water I obtained at the bottom of the tank is in the acidic water-purified water heat exchanger After exchanging heat with qualified purified acidic water and raising the temperature to 95°C, it enters the carbon dioxide stripping tower 2.

[0049] 2) step 1) gained sour water 1 flows from top to bottom in the carbon dioxide stripper 2 and carries out CO 2 and H 2 For the stripping of S, the operating pressure at the top of the carbon dioxide stripping towe...

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Abstract

The invention discloses a method for recovering H2S and NH3 in acidic water and purifying the acidic water. According to the method, the principles that H2S and NH3 are different in volatility and are different in solubility in water are mainly utilized, and H2S and NH3 in the acidic water are recovered while the acidic water is purified. By means of the method, most of H2S can be mainly stripped from the top of a carbon dioxide steam stripping tower, most of HN3 can be mainly stripped from the top of an ammonia steam stripping tower, two gasses are washed and adsorbed respectively, and H2S and NH3 are completely separated.

Description

technical field [0001] The invention relates to a method for recovering H in acidic water 2 S and NH 3 and purify acidic water. Background technique [0002] In recent years, my country's modern coal chemical industry has developed rapidly. A number of demonstration projects of coal-based chemicals and fuels, such as coal-to-oil, coal-to-olefins and their derivatives, coal-to-natural gas, coal-to-dimethyl ether, and coal-to-ethylene glycol, have been constructed and put into operation. China is a country with a lot of coal and a shortage of oil. If coal can be converted into liquid fuels on a large scale with efficient and clean processes, it will effectively alleviate the tightness of oil supply and promote sustainable and stable economic development. At present, many coal chemical projects are facing challenges such as stricter environmental regulations and lower requirements for sulfur content in tail gas emissions. In order to meet the requirements of environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/20C02F1/04C01B17/16C01C1/10
CPCC01B17/167C01C1/10C02F1/04C02F1/048C02F1/20
Inventor 郑明峰余晓忠李鹏武秀丽冯志谦陈晓锐李永旺
Owner SYNEFUELS CHINA