Method for preparing sec-butyl acetate through utilizing etherification C4 fraction
Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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[0009] In order to overcome the problems of low conversion rate and difficult separation of products existing in the prior art, the present invention provides a C 4 Process method for preparing sec-butyl acetate by reacting di
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Embodiment 1
[0025]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, 0.23% isobutene, c -2-butene 11.75% ether after C 4 Distillate, reactor 2 uses n-butene with a purity greater than 99.5%.
[0026] The catalyst adopts macroporous strongly acidic styrene series cationic resin, the brand is NKC-9, and 50 grams of the catalyst are packaged and loaded into two reactors as a whole.
[0027] Step i: The temperature at the top of the reactor is 50°C, the temperature at the bottom of the reactor is 180°C, the pressure is 1.0MPa, and C 4 The carbon tetraolefin / acetic acid molar ratio in the distillate is 0.8, C after ether 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.
[0028] Step ii: The temper...
Embodiment 2
[0031] The raw material of acetic acid 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 Distillate, reactor 2 uses n-butene with a purity greater than 99.5%.
[0032] The catalyst is macroporous strongly acidic styrene series cationic resin, the brand is NKC-9, and 50 grams of the catalyst are packaged and loaded into two reactors as a whole.
[0033] Step i: The temperature at the top of the reactor is 50°C, the temperature at the bottom of the reactor is 150°C, the pressure is 1.0MPa, and C 4 The carbon tetraolefin / acetic acid molar ratio in the distillate is 0.8, C after ether 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.
[0034] Step ii: The temperat...
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Abstract
The invention discloses a method for preparing sec-butyl acetate through utilizing an etherification C4 fraction. The method comprises the following steps: 1, allowing the etherification C4 fraction containing butylene to contact with excess acetic acid in the presence of a catalyst to obtain crude sec-butyl acetate containing acetic acid; and 2, allowing the residual n-butylene to contact with the crude sec-butyl acetate containing acetic acid in the presence of the catalyst to obtain highly pure sec-butyl acetate. The highly pure sec-butyl acetate can be obtained through two steps by using the present catalyst via the method, so the process flow is simple; olefins and alkanes in the etherification C4 fraction are separated, and the highly-pure sec-butyl acetate can be obtained without a separation step; and the adoption of the etherification C4 fraction as a raw material improves the utilization rate of the C4 fraction and greatly reduces the production cost.
Description
technical field [0001] The invention relates to the field of petrochemical industry. Further, the present invention relates to a kind of method that utilizes carbon tetraolefin after ether to prepare sec-butyl acetate. 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 fraction. 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...
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