Catalyst for preparing sec-butyl acetate from carbon tetraolefin

Abstract

The invention discloses a catalyst for the synthesis of sec-butyl acetate from C4 olefins. The catalyst comprises 70-95wt% of zeolite selected from HY-type zeolite or H-type mordenite, 5-30wt% of a binder selected from kaolin, alumina, silica, diatomite and a sol, and 0-5wt% of an oxide selected from phosphorus oxide and boron oxide. Sec-butyl acetate is synthesized from butylene and acetic acid by adopting a zeolite catalyst through a method provided by the invention, and the catalyst has the advantages of easy regeneration, good stability, long service life, and high selectivity of the generated sec-butyl acetate. When an etherification C4 fraction is used as a raw material to prepare sec-butyl acetate, the production cost is greatly reduced, and C4 alkanes can be separated from the etherification C4 fraction.

Description

technical field [0001] The invention relates to the field of petrochemical industry. Further, the present invention relates to a catalyst utilizing carbon tetraolefins to prepare sec-butyl acetate. Background technique [0002] Second-butyl acetate, namely second-butyl acetate and dibutyl acetate, is one of the four isomers of butyl acetate. It is a colorless, flammable, fruit-flavored liquid, and its performance is comparable to that of other isomers. Similar in most cases, it can dissolve various resins and organic substances. Its boiling point is lower than that of commonly used n-butyl ester and isobutyl ester, and its evaporation rate is faster. Secondary butyl acetate has a wide range of uses, and is suitable for medicine, paint, high-grade paint, ink, resin, and acetic acid dehydration and solvents. It can also replace MTBE as an additive for gasoline. It is a fine chemical with a wide range of uses. [0003] The traditional production process of sec-butyl acetate ...

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Problems solved by technology

[0005] CN101121656A discloses a method for synthesizing sec-butyl acetate from acetic acid and linear butene, using modified resin, silica gel-loaded heteropolyacid, silica gel-loaded phosphonic acid or superacid as catalyst, adopting fixed bed reactor, at 90-60 ℃, 2-15kg / cm, acid-ene ratio of 1:1.15-1.8, acetic acid space velocity of 1.0-1.8h -1 Under certain conditions, the conversion rate of acetic acid can reach 71%, and the selectivity of sec-butyl acetate is 98.1%. The disadvantage is that the catalyst activity decreases rapidly.

[0006] CN101948385A discloses a method for synthesizing sec-butyl acetate. The raw material acetic acid and C4 olefins pass through three fixed-bed reactors continuously in the same direction in liquid form. The catalyst used is a macroporous strongly acidic cation exchange resin. Under the conditions of -5MPa and acetic acid space velocity of 0.5-2h-1, the conversion rate of acetic acid can reach 65-90%, and the selectivity of sec-butyl acetate is not mentioned

[0007] CN101735047A discloses a process for continuous production of sec-butyl acetate, using acetic acid and 1-butene as raw materials, solid-liquid mixed acid (cation exchange resin and sulfuric acid) as catalyst, using jet collision flow tower reactor, at 60- Under the conditions of 150°C, 0.2-1.5MPa, and the molar ratio of acetic acid and butene at 1:1.8, the conversion rate of acetic acid is 97%. The equipment investment is large and the operation is troublesome.

But the catalyzer of producing sec-butyl acetate exists at present not high temperature resistant, not easy to regenerate, the shortcoming that active component is easy to lose (being poor in stability) in the use process, and the catalyzer in the prior art and sec-butyl acetate product are not easy to separate, And the catalytic effect is poor, and the selectivity of generating sec-butyl acetate is not high

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