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Purification method and equipment, mixture flow treatment method and device, method for preparing epoxide and epoxidation reaction system

A purification method and epoxide technology, which are used in metal/metal oxide/metal hydroxide catalysts, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of affecting product quality and increasing impurity content of propylene oxide products, etc. problem, to achieve the effect of extending the service life of one-way

Pending Publication Date: 2022-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] But, when adopting the disclosed method of CN1649858A to epoxidize olefins and reclaim the alcohol solvent, it is found that although the reclaimed stream containing the alcohol solvent is hydrogenated, the passivation speed of the epoxidation reaction catalyst can be alleviated to a certain extent, but the device continues to After running for a period of time, the impurity content in the propylene oxide product increases, which affects the product quality

Method used

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  • Purification method and equipment, mixture flow treatment method and device, method for preparing epoxide and epoxidation reaction system

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Embodiment approach

[0091] In one embodiment (hereinafter referred to as "the first embodiment"), the separation step includes a first rectification and a second rectification,

[0092] In the first rectification, the liquid phase stream containing alcohol and / or the adjustment stream (when the adjustment step is performed, it is the adjustment stream; when the adjustment step is not performed, it is the alcohol-containing liquid phase stream) in In the first rectification tower, the first rectification is carried out under the first rectification pressure, the first distillate containing alcohol is obtained from the top of the first rectification tower, and the first tower bottom containing alcohol and water is obtained from the bottom of the tower logistics;

[0093] In the second rectification, the first bottom stream is subjected to the second rectification in the second rectification tower under the second rectification pressure, and the second rectification containing alcohol is obtained fr...

Embodiment 1

[0175] This embodiment adopts figure 1 The processing method shown processes a mixture stream consisting of:

[0176]Based on the total amount of the mixture stream, it contains 82.38% by weight methanol, 16.07% by weight water, 1100ppmw aldehyde, 3300ppmw hydrogen peroxide, 3ppmw propylene oxide, 8ppmw hydrazine, 9ppmw ammonia, 5ppmw hydrazone, and the balance is other impurities.

[0177] The preparation method of the catalyst with hydrogenation catalysis that present embodiment adopts is as follows:

[0178] In the reactor, add 20kg water, add 4.5kg pseudo-boehmite powder (production of Changling Catalyst Factory, solid content is 69.5% by weight, gamma-Al 2 o 3 content not less than 98% by weight), stir and mix evenly; add 200g concentrated hydrochloric acid (Sinopharm Chemical Reagent Co., Ltd., concentration is 36% by weight), mix and grind; add 2.3kg polyethylene glycol PEG4000 powder (Wenzhou Shuangxiao Rubber Plastic Materials Co., Ltd.), continue beating, stir and...

Embodiment 2

[0193] The mixed stream is treated in the same manner as in Example 1, and the recovered alcohol is used for the epoxidation reaction. The difference is that the reaction temperature of the hydrotreating reactor 5 is 70° C., the pressure is 0.8 MPag, and the liquid hour The volumetric space velocity is 1h -1 . The reaction temperature of the methanation reactor 6 is 90°C, the pressure is 1MPag, and the gas hourly volume space velocity is 1500h -1 , the experimental results are as follows:

[0194] (1) The carbon monoxide content in the outlet stream of the methanation reactor remains below 1 ppmw;

[0195] (2) The one-way service life of the catalyst with hydrogenation catalysis is 15 months;

[0196] (3) collect the composition of the methanol extracted from the first rectification tower and the second rectification tower, and determine that the purity of reclaimed methanol is more than 98% by weight;

[0197] (4) The purity of the propylene oxide product is 99.95% by wei...

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Abstract

The invention discloses a purification method and equipment, a mixture flow treatment method and device, a method for preparing epoxide and an epoxidation reaction system. The purification method comprises bringing alcohol containing impurities and hydrogen into contact with a catalyst with a hydrogenation catalysis function to obtain a hydrogenation product stream with the impurity content reduced, and separating the product stream to obtain a gas-phase material stream containing hydrogen; treating the gas-phase material stream to obtain a treated material stream with a reduced carbon monoxide content; recycling at least a portion of the treated stream for use as at least a portion of the hydrogen. According to the purification method and the purification equipment provided by the invention, the content of carbon monoxide in the gas-phase material flow separated from the hydrogenation reaction product material stream is reduced, and then the gas-phase material stream is used as recycle hydrogen for hydrogenation reaction, so that the one-way service lifetime of a hydrogenation catalyst can be effectively prolonged, and the impurity content in alcohol is kept at a lower level for a long time; and the quality of the epoxypropane product is maintained at a relatively high level for a long time.

Description

technical field [0001] The present invention relates to a purification method and purification equipment for reducing the content of impurities in alcohol. The present invention also relates to a treatment method and a solvent separation device for a mixed flow containing impurities, alcohol and water. The present invention further relates to a preparation ring Oxidation methods and epoxidation reaction systems. Background technique [0002] Propylene oxide (PO) is the third largest raw material of propylene-derived organic compounds after polypropylene and acrylonitrile, and is mainly used in the production of polyether and propylene glycol. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. [0003] Propylene oxide production processes mainly include chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/152C07C29/156C07C29/80C07C31/04C07D301/12C07D303/04B01J23/755B01J21/04B01J32/00B01J35/08B01J37/00B01J37/02B01J37/08B01J8/02B01D53/62B01D53/86
CPCC07C29/152C07C29/156C07C29/80C07D301/12C07D303/04B01J23/755B01J21/04B01J37/0018B01J37/0201B01J37/088B01J8/0278B01D53/864B01D2257/502B01J35/51C07C31/04Y02A50/20Y02P20/52
Inventor 李红波张得江丁晖殿王皓王瑾林民罗一斌朱斌
Owner CHINA PETROLEUM & CHEM CORP
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