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C3 fraction liquid phase selective hydrogenation method

A technology for selective hydrogenation and fractionation, which is applied in the fields of hydrocarbons, chemical instruments and methods, and hydrocarbon purification/separation. The effect of energy consumption, improving removal effect, and simplifying the liquid-phase selective hydrogenation process of carbon three fractions

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the method of liquid-phase selective hydrogenation of C3 fractions in the prior art, propyne and / or propadiene in C3 fractions cannot be effectively removed, the catalyst has short service life, low catalyst activity, and the liquid-phase selective hydrogenation process of C3 fractions Due to the defects of complexity and high energy consumption, the present invention provides a new method for liquid-phase selective hydrogenation of carbon three fractions

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0079] according to figure 1 The flow process of the carbon three liquid phase selective hydrogenation shown in the present invention.

[0080] The material f1 (flow rate is 170t / h, the sum of the molar content of propyne and propadiene is 3% by the material f1 (flow rate is 170t / h, the molar content sum of propyne and propadiene is 3%, water mol content is 25ppm, the molar content of methanol is 170ppm, and the molar content of arsenic is less than 3ppb) through pump S1, it passes through water remover S2, methanol remover S9 (S2 and S9 are filled with 3A molecular sieve produced by UOP Company) and remover Arsenic reactor R2 (the reactor is filled with R3-12 catalyst produced by BASF company, the reaction temperature is 37 ° C, and the reaction pressure is 2.4 MPa), to obtain fresh carbon three cuts a (the sum of the molar content of propyne and propadiene 3%, the molar content of water is less than 5ppm, the molar content of methanol is less than 10ppm, and the molar conte...

Embodiment 2

[0090] According to the method described in embodiment 1, the difference is that the flow rate of the fresh carbon three fraction a is 190t / h, the flow rate of the circulating carbon three stream b is 90t / h, and the flow rate of the gas phase stream g is 105t / h, correspondingly, by Adjust the flow rate of the gaseous phase stream g entering the propylene rectification tower to adjust the pressure of the selective hydrogenation reactor to 2.45MPa.

[0091] By adopting the method provided in this example, the molar content of propyne and propadiene in the gas phase stream g obtained after gas-liquid separation is less than 100 ppm. After adopting the process method, the operating period of the selective hydrogenation catalyst reaches more than 8 months.

Embodiment 3

[0093] according to figure 1 The flow process of the carbon three liquid phase selective hydrogenation shown in the present invention.

[0094] The material f1 (flow rate is 140t / h, the molar content sum of propyne and propadiene is 2.4% by the material f1 (flow rate is 140t / h, the molar content sum of propyne and propadiene is 2.4%, water mole) content is 25ppm, the molar content of methanol is 150ppm, and the molar content of arsenic is lower than 3ppb) through the pump S1 and then through the water remover S2, the methanol remover S9 (both S2 and S9 are filled with 3A molecular sieves produced by UOP Company) and the removal Arsenic reactor R2 (the reactor is filled with R3-12 catalyst produced by BASF company, the reaction temperature is 39 ℃, and the reaction pressure is 2.35MPa) to obtain fresh carbon three cuts a (the sum of the molar content of propyne and propadiene is 2.4%, the molar content of water is less than 5ppm, the molar content of methanol is less than 10pp...

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Abstract

The invention discloses a C3 fraction liquid phase selective hydrogenation method. The method comprises pretreating a C3 fraction collected from a depropanizing tower in a propylene production process to obtain a fresh C3 fraction a, mixing the fresh C3 fraction a, a recycle C3 flow b and hydrogen c, contacting the mixture and a selective hydrogenation catalyst for selective hydrogenation, carrying out gas-liquid separation on the hydrogenation product to obtain a gas phase flow g containing propylene and propane and a liquid phase flow h containing propylene and propane, dividing the liquid phase flow h containing propylene and propane into a first part flow i as a recycle C3 flow b and a second part flow j, and returning the second part flow j into a depropanization tower. The method effectively removes propyne and / or propadiene in the C3 fraction, prolongs a service life of the catalyst, reduces energy consumption, and has the superiority compared with the prior art.

Description

technical field [0001] The invention relates to a method for liquid-phase selective hydrogenation of carbon three fractions. Background technique [0002] Steam cracking of petroleum hydrocarbons is the most important method for preparing polyolefin monomers such as propylene. The alkynes and dienes produced in the propylene production process are harmful impurities that affect the propylene polymerization reaction. They will inhibit the activity of the propylene polymerization catalyst, increase the consumption of the catalyst, and reduce the properties of the propylene polymer product, so they must be removed. In industry, catalytic selective hydrogenation and solvent absorption are usually used to remove alkynes and dienes in cracked gas. The process of catalytic selective hydrogenation is simple, the selectivity of propylene is high, the rich product is less, and there is no environmental pollution. It is the preferred method of green chemical process and its applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/167C07C7/163C07C11/06
CPCC07C7/005C07C7/163C07C7/167C07C11/06
Inventor 易水生乐毅毛祖旺房艳彭晖
Owner CHINA PETROLEUM & CHEM CORP
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