Catalyst for preparing propylene from C4 olefins, and application and regeneration method thereof

A carbon tetraolefin and catalyst technology, applied in the field of catalyst and its application and regeneration, can solve the problems of catalyst stability and regeneration that are not seen, and achieve the effects of simple preparation method and regeneration method, low reaction temperature and long service cycle

Active Publication Date: 2010-12-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The existing patents mainly focus on the modification and preparation process of molecular sieves, and there are no relevant reports on catalyst stability and regeneration

Method used

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  • Catalyst for preparing propylene from C4 olefins, and application and regeneration method thereof
  • Catalyst for preparing propylene from C4 olefins, and application and regeneration method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 prepares catalyst A

[0037] 85g ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 >200), 15g silicon oxide and 2g squash powder; mix well, add 80ml 5% phosphoric acid, mix well, extrude into 2mm cylindrical shape, and cut into 2~3mm; dry at 80℃ and 120℃ respectively 10 hours, and then calcined at 580°C for 6 hours, took it out and cooled it to room temperature, and put it in a desiccator for later use. The catalyst prepared in this way is designated Catalyst A.

Embodiment 2

[0038] Embodiment 2 prepares catalyst B

[0039] 75g ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 >200), 10g of silicon oxide, 10g of calcium oxide, 2g of boron oxide and 2g of turnip powder were mixed, and after mixing, 80ml of 5% nitric acid was added. Other operating methods are the same as in Example 1. The catalyst prepared in this way was designated Catalyst B.

Embodiment 3

[0040] Embodiment 3 prepares catalyst C

[0041] 75g ZRP molecular sieve (SiO 2 / Al 2 o 3 >200), 10g of silicon oxide, 10g of calcium oxide, 2g of lithium oxide and 2g of turnip powder were mixed, and after mixing, 80ml of 5% phosphoric acid was added. Other operating methods are the same as in Example 1. The catalyst prepared in this way is designated Catalyst C.

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Abstract

The invention discloses a method for increasing yield of propylene by using C4 fraction in ethylene plants and oil plants. In order to solve the problems of catalyst stability and regeneration in the prior art for preparing propylene from C4 olefins, high-silica zeolite and silicon oxide are selected as the main components of the catalyst, and basic oxides and acidic oxides are used for modification to prepare the olefin conversion catalyst, wherein the basic oxides are preferably calcium oxide and lithium oxide, and the acidic oxides are preferably boron oxide and phosphorus oxide. After being tested, the catalyst has favorable stability, and various properties can be restored after the catalyst is regenerated. The application method of the catalyst comprises the following steps: using the mixture of raffinate I or etherified C4 as the raw material, exchanging heat, preheating, contacting with high silicon/aluminum ratio zeolite catalyst in a fixed bed adiabatic reactor to generate the reactant mixture containing ethylene and propylene, exchanging heat, cooling and separating to obtain propylene, ethylene and the like for cycle use. The invention provides an industrially available method.

Description

technical field [0001] The present invention relates to a kind of catalyst for preparing low-carbon olefins and its application and regeneration method, specifically, the present invention relates to a kind of catalyst and its application for preparing propylene from C4 raffinate I of ethylene plant or C4 fraction of refinery and regeneration methods. Background technique [0002] Propylene is an important organic chemical raw material second only to ethylene. With the rapid development of the national economy, the demand for it is also increasing. At present, the supply of propylene in my country is in short supply, and the traditional method of increasing propylene production can no longer meet the demand of the market. Hydrocarbon steam cracking and catalytic cracking are two major sources of propylene. The former can increase the production of propylene by reducing the depth of cracking, but the growth capacity is limited; the latter can increase the production of propy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/40B01J21/08B01J23/04B01J23/02B01J21/02B01J27/16C07C11/06C07C4/06B01J38/14
CPCY02P20/52Y02P20/584
Inventor 王定博刘小波马志元王超戴伟
Owner CHINA PETROLEUM & CHEM CORP
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