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Method for separating alkanes and olefin in etherification C4 fractions

A technology for C4 fractionation and middle carbon tetraalkanes, which is applied in the direction of chemical change purification/separation, organic chemistry, etc., can solve the problems of easy decomposition of solvents, high cost, large investment, etc., and achieve the effect of wide application and complete separation

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of large investment, high cost, and easy decomposition of solvents in the prior art, the invention provides a C 4 The method of olefins and alkanes in the fraction has the advantages of simple process and complete separation effect

Method used

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  • Method for separating alkanes and olefin in etherification C4 fractions

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Experimental program
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Embodiment 1

[0023] The acetic acid raw material is glacial acetic acid with a purity greater than 99.5%. Reactor 1 is composed of 44.19% isobutane, 13.23% n-butane, 13.76% 1-butene, 16.55% t-2-butene, 0.1% isobutene, c -2-butene 11.75% ether after C 4 fraction.

[0024] The catalyst is macroporous strongly acidic styrene series cationic resin, the brand is NKC-9, and 50 grams of the catalyst is packaged and loaded into the reactor as a whole.

[0025] Step i: The temperature at the top of the reactor is 50°C, the temperature at the bottom of the reactor is 180°C, and the pressure is 1.0MPa. After acetic acid and ether, C 4 The molar ratio of carbon tetraolefins in the distillate is 1.1, after the ether C 4 Distillate weight space velocity 3h -1 . Acetic acid enters from the top of reactor 1 with a metering pump, and after ether, C 4 The fraction enters from the bottom of Reactor 1 through a liquid mass flow meter.

[0026] Step ii: The temperature at the top of the reactor is 30°C, ...

Embodiment 2

[0029] The acetic acid raw material is glacial acetic acid with a purity greater than 99.5%. Reactor 1 is composed of 0.25% isobutane, 20.45% n-butane, 5.11% 1-butene, 43.72% t-2-butene, 0.12% isobutene, c -2-butene 30.17% ether after C 4 fraction.

[0030] The catalyst is macroporous strongly acidic styrene series cationic resin, the brand is NKC-9, and 50 grams of the catalyst is packaged and loaded into the reactor as a whole.

[0031] Step i: The temperature at the top of the reactor is 50°C, the temperature at the bottom of the reactor is 150°C, and the pressure is 1.0MPa. After acetic acid and ether, C 4 The molar ratio of carbon tetraolefins in the distillate is 1.1, after the ether C 4 Distillate weight space velocity 2h -1 . Acetic acid enters from the top of reactor 1 with a metering pump, and after ether, C 4 The fraction enters from the bottom of Reactor 1 through a liquid mass flow meter.

[0032] Step ii: The temperature at the top of the reactor is 30°C, t...

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Abstract

The invention discloses a method for separating alkanes and olefin in etherification C4 fractions. The method comprises the following steps: 1, allowing the etherification C4 fractions to contact with acetic acid under the action of a catalyst to obtain sec-butyl acetate, and separating out C4 alkanes; and 2, cracking sec-butyl acetate to obtain acetic acid and n-butene. The method, which is characterized in that the acetic acid completely reacts with butylene in the etherification C4 fractions to generate sec-butyl acetate and obtain the C4 alkanes and sec-butyl acetate is cracked to obtain widely used n-butene, realizes the separation of the alkanes from the etherification C4 fractions, the complete separation of the alkanes from olefins and the obtaining of widely used n-butene through a simple technology.

Description

technical field [0001] The invention relates to the field of petrochemical industry. Further, the present invention relates to a C 4 Method for carbon tetraalkanes and alkenes in fractions. Background technique [0002] With changes in the pattern of petrochemical resources, C4 fractions from ethylene plants and refineries are becoming more and more valuable. 4 The utilization of the product is not sufficient, and currently the most utilized is isobutene and butadiene in the C4 product. The C4 fraction of the refinery does not contain butadiene, and can be directly etherified. The C4 fraction of the ethylene plant contains about 45% butadiene, and the butadiene needs to be extracted before the etherification reaction. At present, the technology for producing methyl tert-butyl ether (MTBE) is very mature. Every petrochemical enterprise has an etherification device. MTBE is prepared by mixing C4 fractions and methanol. The isobutene is basically completely reacted, and the ...

Claims

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Application Information

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IPC IPC(8): C07C7/148C07C9/10C07C11/08
Inventor 王定博张明森郭敬杭马志元
Owner CHINA PETROLEUM & CHEM CORP
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