Method for lowering organic matter content in absorption liquid during acrylonitrile non-ammonium-sulfate process
A technology for absorbing liquid and acrylonitrile, which is applied in the fields of organic chemistry, ammonia preparation/separation, hydrocarbon ammoxidation preparation, etc. It can solve the problems of high energy consumption and low removal effect of organic impurities, so as to improve the removal effect and reduce energy consumption , the effect of good technical effect
Inactive Publication Date: 2014-01-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is that the use of wet oxidation in the prior art leads to high energy consumption and low removal effect of organic impurities in the absorption liquid. It provides a new method for reducing the content of organic matter in the absorption liquid in the acrylonitrile sulfur-free ammonium process. method
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[0015] Example by figure 1 The process operation shown, such as figure 1 As shown, the acrylonitrile reaction gas contacts and absorbs unreacted ammonia in the quench tower 1 with the poor ammonium absorption liquid 12 to obtain the reaction gas 5 and the rich ammonium absorption liquid 2 without ammonia, and the rich ammonium absorption liquid 2 is vaporized in the stripping tower 3 Gas stripping 5 strips light organic components 4 and enters special oil-water separation device 8 to remove light organic components 7 and heavy components such as catalysts and polymers 9 to obtain ammonium-rich absorption liquid 10, and then enters desorption tower 11 for analysis to obtain crude ammonia The gas stream 13 and the ammonium-depleted absorption liquid 12 are returned to the quench tower for absorption of unreacted ammonia. The crude ammonia gas flow 13 is rectified in the rectification tower 14 to obtain anhydrous ammonia 16 and returned to the acrylonitrile reactor 17 for ammoxi...
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The invention relates to a method for lowering the organic matter content in an absorption liquid during an acrylonitrile non-ammonium-sulfate process and is mainly used for solving the problems of high energy consumption and poor effect of removing organic impurities out of absorption liquid in the prior art. According to the technical scheme, the method comprises the following steps: (1) enabling a reaction gas I and a low-ammonium absorption liquid I to come into contact with unreacted ammonium in a quenching tower so as to obtain a high-ammonium absorption liquid II and a ammonium-free reaction gas II; (2) performing steam stripping on the high-ammonium absorption liquid II in a stripping tower, regulating a pH value by adding an acid and then performing oil-water separation so as to obtain a high-ammonium absorption liquid III; heating the high-ammonium absorption liquid III in a resolving tower and performing the steam stripping so as to obtain an ammonium gasflow III and a low-ammonium absorption liquid IV; returning the absorption liquid IV into the quenching tower for absorbing the unreacted ammonium; and (3) performing rectification separation on the ammonium gasflow III in an ammonium rectification tower so as to obtain ammonium IV with high purity; and returning the ammonium IV into an ammonium oxidation reactor and reacting. Thus, the problems in the prior art are solved well. The method provided by the invention can be applied to an industrial device of acrylonitrile.
Description
technical field [0001] The invention relates to a method for reducing the content of organic matter in an absorbing liquid in an acrylonitrile sulfur-free ammonium process. Background technique [0002] During the production of acrylonitrile, about 10% of unreacted ammonia needs to be absorbed and separated from the reactant stream. Although there are techniques to reduce the ammonia content at the reactor outlet, there is still a large amount of unreacted ammonia. The current production process is mainly to absorb unreacted ammonia through sulfuric acid washing, and the ammonium sulfate wastewater is directly injected into the deep well for treatment, or the crystalline ammonium sulfate is recovered through the ammonium sulfate recovery section, or the ammonium sulfate is incinerated to produce SO 3 , and then absorbed to make sulfuric acid back to the system for recycling. There are also some patents that recover unreacted ammonia through the neutralization of phosphoric...
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IPC IPC(8): C07C255/08C07C253/26C01C1/12
Inventor 郭宗英吴粮华
Owner CHINA PETROLEUM & CHEM CORP