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Olefin isomerization catalyst and preparation method thereof

A technology for olefin isomerization and catalysts, which is applied in the field of olefin isomerization catalysts and its preparation, can solve problems such as the complexity of the reaction process, and achieve the effects of increased yield, easy control, and simple preparation methods

Active Publication Date: 2016-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, before the olefin isomerization reaction, a step of high-temperature pre-coking treatment using hydrocarbons as raw materials under an inert atmosphere is added, which complicates the reaction process

Method used

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  • Olefin isomerization catalyst and preparation method thereof

Examples

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Comparison scheme
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preparation example Construction

[0014] The preparation method of the catalyst provided by the present invention includes mixing molecular sieves and binders, drying and roasting to obtain a carrier, and then impregnating with an aqueous solution of a modified compound. dry.

[0015] The molecular sieve is preferably one or any two of ZSM-35, ZSM-22 and SAPO-11, and the binder is preferably alumina.

[0016] The method of mixing molecular sieve and binder in the method of the present invention is extruding, dropping ball, rolling ball or tableting method, preferably extruding. The extruding method is as follows: uniformly mix the molecular sieve with the binder or its precursor, add an appropriate amount of extrusion aid and / or peptizer and knead, and then extrude. The extrusion aid is preferably squash powder, and the peptizing agent is preferably an inorganic acid, such as hydrochloric acid or nitric acid. After the wet strip is cut into pellets, the carrier is obtained by drying and roasting. The temper...

example 1

[0027] Mix 10788 grams of HZSM-35 molecular sieve with a molar ratio of silica to alumina of 25 and 1637.8 grams of pseudoboehmite, add 65.5 grams of nitric acid with a concentration of 65% by mass and 10770 grams of water, and extrude with a twin-screw extruder The trefoil strips with a diameter of 1.1 mm were cut into pellets, dried at 120°C for 4 hours, and calcined at 550°C for 2 hours to obtain the carrier S 1 , wherein the content of HZSM-35 molecular sieve is 90% by mass, and the content of alumina is 10% by mass.

[0028] Take 2000 grams of carrier S 1 , impregnated with 1939 ml of an aqueous solution containing 146.2 grams (0.601 mol) of triammonium citrate at 25 ° C for 0.5 hours, and then dried at 90 ° C and 0.01 MPa for 2 hours to obtain catalyst C 1 , whose weight is 2145.1 g, indicating that the catalyst C 1 Contains 145.1 grams of triammonium citrate, ammonium salt and carrier S 1 The mass ratio is 0.073.

example 2

[0030] Take 2000 grams of carrier S 1 , impregnated with 1939 ml of an aqueous solution containing 251.6 g (1.497 mol) of ammonium malate at 25 ° C for 0.5 hours, and then dried at 90 ° C and 0.01 MPa for 2 hours to obtain catalyst C 2 , whose weight is 2250.8 g, indicating that the catalyst C 2 Contains 250.8 grams of ammonium malate, which contains ammonium salt and carrier S 1 The mass ratio is 0.125.

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Abstract

The invention discloses an alkene isomerization catalyst which comprises a carrier and a modified compound, wherein the modified compound is organic acid ammonia, the mass ratio of the modified compound to the carrier is (0.01-0.4):1, and the carrier comprises a molecular sieve and a binder. According to the catalyst, the catalytic active component is modified by the modified compound, so that the isomerization selectivity of the catalyst can be remarkably improved.

Description

technical field [0001] The invention is an olefin isomerization catalyst and a preparation method thereof, specifically, a normal olefin skeleton isomerization catalyst and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection requirements, the demand for clean gasoline continues to increase. Orthomorphic C 4 ~C 6 Isobutene, methylpentene and dimethylbutene obtained through skeletal isomerization of olefins can be etherified to prepare high-octane gasoline additives to improve gasoline quality. [0003] USP5,382,743 discloses a method of using ZSM-35 molecular sieve to carry out skeletal isomerization reaction of n-pentene under the condition of hydrogen, and finds that the reaction under the condition of hydrogen is conducive to improving the reactivity of the catalyst and reducing the loss of activity rate and prolong catalyst life. [0004] USP5,817,907 discloses a method for skeletal isomerization of line...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/04C07C5/27C07C11/10
Inventor 李金芝龙军于中伟孔令江
Owner CHINA PETROLEUM & CHEM CORP
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