A method and device for preparing sodium bicarbonate by acid gas
A sodium bicarbonate and acid gas technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low purity of sulfur products, expensive desulfurization catalysts, failure to realize continuous production normally, etc.
Active Publication Date: 2017-08-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
This technology has problems such as expensive desulfurization catalyst, sulfur foam entrainment catalyst, low purity of sulfur product, and solid waste generation.
[0017] Acid gas is a mixed gas of hydrogen sulfide and carbon dioxide gas: in the field of petrochemical industry, acid gas is usually a mixture of hydrogen sulfide and carbon dioxide. When using alkali agent as absorbent to produce sodium sulfide or sodium hydrogen sulfide solution products, sulfide gas is usually formed. Sodium, sodium bisulfide, sodium carbonate, sodium bicarbonate and other substances, when the concentration reaches a certain value, crystallization will occur, causing the device to be blocked and continuous production cannot be realized normally
Method used
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Embodiment 1
[0087] use as figure 1 The shown method and device react with acid gas as raw material. CO in acid gas 2 The volume fraction is 7%, H 2 The volume fraction of S is 92%, and the volume fraction of hydrocarbons is 1%.
[0088] In embodiment 1, described absorption reactor adopts such as figure 2 Structure. In Example 1, the 22nd stream obtained from the absorption reactor accounts for 20% of the total volume flow of the 2nd stream. The temperature range of the sodium hydrosulfide solution heated by the heating tank is 90°C~99°C, and the mass concentration of the sodium hydroxide solution prepared by using the process generated water is 38%. The 42nd stream accounts for 20% of the total volume flow of the 4th stream. The liquid-gas ratio of absorption liquid and acid gas in the absorption reactor is 5L / m 3 . The reaction temperature was controlled between 80°C and 85°C, and the reaction results are shown in Table 1.
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Abstract
The invention provides a method and device for preparing sodium hydrosulfide through acidic gas. The method uses sodium hydroxide powder as a raw material, uses process condensed water to prepare a solution, and reacts with part of the product liquid to generate sodium sulfide as an absorption liquid. The five-stage process of absorption reaction, heating, flash decomposition, solid-liquid separation, and gas cooling and collection realizes exhaust emission standards and produces chemical products that meet national product quality standards. The process device is composed of a liquid film absorption reactor, a heating tank, a flash separation tank, a solid-liquid separator, a cooler, a process pipeline and a mechanical pump. The method and device for preparing sodium hydrosulfide from acid gas in the present invention use sodium carbonate and acid gas as raw materials to produce solid sodium bicarbonate and high-purity hydrogen sulfide gas, and realize the dual goals of acid gas purification and pollutant recycling.
Description
technical field [0001] The invention relates to a method and a device for preparing sodium bicarbonate from acid gas, which belong to the field of chemical engineering and are suitable for the comprehensive utilization of acid gas in the petrochemical field. Background technique [0002] Sulfur element is ubiquitous in fossil fuels. When petroleum enters the process of fine fractionation and deep processing, it forms hydrogen sulfide gas with hydrogen. This process is often accompanied by carbon dioxide gas and ammonia gas. Sulfur element also exists in the raw materials of the metallurgical industry, but because the processing process is mostly under high temperature conditions, the sulfur element is oxidized, mainly producing sulfuric acid gas. Other working conditions that generate acid gas mostly occur in the chemical production process or the use process of chemical products. [0003] Acid gas in the petrochemical industry mainly comes from natural gas exploitation, oi...
Claims
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IPC IPC(8): C01B17/32
Inventor 彭德强乐忠辉齐慧敏王璐瑶孟凡飞陈新刘杰
Owner CHINA PETROLEUM & CHEM CORP
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