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Method for controlling addition amount of VPO catalyst assistant water in MAH preparation process

A preparation process and catalyst technology, applied in the direction of organic chemistry, etc., can solve the problems of unspecified water control addition method and addition amount, etc., and achieve the effects of improving high selectivity and yield, improving selectivity, and improving quality yield.

Active Publication Date: 2018-04-27
SINOPEC YIZHENG CHEM FIBER +1
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  • Description
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Problems solved by technology

This patented technology improves the selectivity and yield of the catalyst by adding trimethyl phosphate and then using water treatment, but it does not explain the controlled addition method and amount of water, and the influence of the humidity of the air itself on the performance of the catalyst

Method used

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  • Method for controlling addition amount of VPO catalyst assistant water in MAH preparation process
  • Method for controlling addition amount of VPO catalyst assistant water in MAH preparation process
  • Method for controlling addition amount of VPO catalyst assistant water in MAH preparation process

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Embodiment

[0038] In the 120,000 tons / year MAH production unit provided by HUNSTMAN technology, n-butane is in the shell-and-tube fixed bed reactor under the condition of VPO catalyst, the catalyst bed height is 5900mm, the catalyst tube diameter is 25mm, and the butane concentration is 1.85mol %, Airspeed 1560h -1 , trimethyl phosphate (TMP) 8ppm, reactor inlet pressure 180Kpag, using figure 1 Water is added in the process flow shown to ensure that the water concentration in the mixed gas is 2.4mol%. The catalyst runs to 1935 hours, the conversion rate is 83.2%, the mass yield is 98.2%, and the selectivity is 70%; the conversion rate is 83.2%, the mass yield is 98.2%, and the selectivity is 70%; the operation is 2031 hours, and the conversion The yield is 83.2%, the mass yield is 98.2%, and the selectivity is 70%.

[0039] In summary, the present invention uses a temperature and humidity meter to measure the ambient temperature T and relative humidity RH, and calculates the amount of ...

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Abstract

The invention relates to a method for controlling the addition amount of a VPO (vanadium phosphorus oxide) catalyst assistant water in the MAH (maleic anhydride) preparation process. The method is characterized in that a water control valve connected to a shell-and-tube fixed bed reactor for preparing MAH is connected with an atmospheric thermohygrograph and a calculating module, the atmospheric thermohygrograph measures the ambient temperature T and the relative humidity RH, measured values are input into the calculating module, and the addition amount of the assistant water is calculated according to a formula and can be accurately controlled. The method realizes the accurate control of the addition amount of the catalyst bed assistant water to make the humidity of a butane mixed gas entering the reactor keep constant and be not affected by the humiture, improves the selectivity of a catalyst by 2.1%, improves the yield by 2.4%, and avoids uneven temperature distribution of the reactor, caused by concentration of phosphide at the feed inlet of the reactor due to too low amount of water, and increase of byproducts, caused by the excessive amount of the water.

Description

technical field [0001] The invention relates to the field of catalytic oxidation of hydrocarbons with more than 4 carbon atoms, in particular to a method for precisely controlling the addition of catalyst additive water in the process of producing maleic anhydride with n-butane as raw material. Background technique [0002] Maleic anhydride (MAH) is a commonly used basic organic chemical raw material and the second largest acid anhydride raw material in the world after phthalic anhydride, and its downstream products have quite broad development and application prospects. MAH is widely used in synthetic resins, lubricating oil additives, pharmaceuticals, food additives, 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, fumaric acid and a series of important organic chemicals and fine chemicals. [0003] The production of MAH by n-butane oxidation is based on vanadium phosphorus oxygen (VPO) catalyst or VPO catalyst containing a small amount of additives, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
CPCC07D307/60
Inventor 杨效军陈志明李剑杨如惠张威赵东一眭伟华徐星宇
Owner SINOPEC YIZHENG CHEM FIBER
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