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Olefin isomerization method

A technology of isomerization and isomerization of olefins, applied in the field of isomerization of olefins and skeletal isomerization of post-ether normal olefins. Active olefins and other problems, to achieve the effect of inhibiting polymerization and coking, realizing long-term continuous production, and prolonging the life of a single pass

Active Publication Date: 2021-07-16
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the one-way life of the catalyst is only about 50 hours, the catalyst must be regenerated or activated, or even a new catalyst needs to be prepared, so that the long-term operation of isomeric olefin production cannot be achieved, so a large amount of active olefins cannot be obtained
[0008] In fact, the current production of active olefins through isomerization of normal olefins, most of the production cycle does not exceed 10 days, which seriously affects the production of active olefins, so it still cannot meet the demand for active olefins in the etherification unit

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0047] 1. Synthesis of sodium ZSM-35 molecular sieve

[0048] Using silica sol as the silicon source, aluminum sulfate as the aluminum source, and ethylenediamine as the template, the above-mentioned silicon source, aluminum source, template and concentration are mixed with an aqueous sodium hydroxide solution of 11.2mol / L, and the Al 2 o 3 : SiO 2 : Templating agent: H 2 The ratio of O is 1:29:9:500, and the hydrothermal synthesis reaction is carried out under the conditions of pH value of about 12, temperature of 170°C, and pressure of 0.6MPa. The reaction time is 60 hours. After the reaction, deionized Wash the filtrate with water until neutral, and dry the filter cake to obtain Na-type ZSM-35 molecular sieve with a silicon-aluminum ratio of 25. Observed under the scanning electron microscope, the Na-type ZSM-35 molecular sieve prepared under the above conditions has a nano-sheet structure, such as Figure 1 to Figure 3 shown; the measured specific surface area is 390m ...

Embodiment 2

[0057] 1. Synthesis of sodium ZSM-35 molecular sieve

[0058] Using silica sol as the silicon source, sodium aluminate as the aluminum source, and cyclohexylamine as the template agent, the above-mentioned silicon source, aluminum source, template agent and a concentration of 11.2mol / L sodium hydroxide aqueous solution are mixed, and the Al 2 o 3 : SiO 2 : Templating agent: H 2 The ratio of O is 1:36:12:500, and the hydrothermal synthesis reaction is carried out under the conditions of pH value of about 12, temperature of 160°C, and pressure of 0.6MPa. The reaction time is about 60h. After the reaction, deionized Wash the filtrate with water until neutral, and dry the filter cake to obtain Na-type ZSM-35 molecular sieve, which has a silicon-aluminum ratio of 30.

[0059] 2. Preparation of isomerization catalyst

[0060] Modification of γ-Al with Potassium Nitrate 2 o 3 , using equal volume impregnation, K 2 The O content is 2%, dried at 110°C for 8 hours, and calcined a...

Embodiment 3

[0067] 1. Preparation of isomerization catalyst

[0068] Modification of γ-Al with copper nitrate 2 o 3 , using equal volume impregnation, the content of copper oxide is 2%, drying at 110°C for 8 hours, and roasting at 540°C for 6 hours to obtain a modified catalyst carrier;

[0069] Mix the above-mentioned modified catalyst carrier with the sodium ZSM-35 molecular sieve prepared in Example 1 according to the mass ratio of 20:80, then add 3% aqueous solution of dilute nitric acid, kneading and extrusion molding, and dry at 110°C 8 hours, roasting at 540° C. for 6 hours to obtain a catalyst intermediate;

[0070] Configure 1mol / L NH 4 Cl solution, according to the mass ratio of catalyst intermediate product: ammonium chloride solution being 1: 10, refluxed for 6 hours under 85°C water bath, filtered, dried at about 95°C, and roasted at about 540°C to obtain the isomerization catalyst, record for ISO-UPC-3.

[0071] 3. Olefin isomerization method

[0072] Take 20g of isome...

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Abstract

The invention provides an olefin isomerization method which comprises the following steps: carrying out an isomerization reaction on an olefin raw material by using an isomerization catalyst, and controlling the isomerization reaction temperature to be 240-480 DEG C, the reaction pressure to be 0-1.0 MPa and the reaction space velocity to be 2-10 h<-1>, wherein the isomerization catalyst is a product prepared by the following preparation method: modifying a catalyst carrier with a metal salt to obtain a modified catalyst carrier; mixing a sodium type molecular sieve with the modified catalyst carrier, and then carrying out acid treatment, molding treatment, drying and roasting to obtain a catalyst intermediate product; and carrying out ion exchange on the catalyst intermediate product by adopting an ammonium salt solution, and then filtering, drying and roasting to obtain the isomerization catalyst. According to the olefin isomerization method provided by the invention, the isomerization catalyst obtained by adopting a specific preparation method is used, so that long-period operation of olefin isomerization can be realized while normal olefin is effectively converted into active olefin, and yield increase of an etherification unit is favorably realized.

Description

technical field [0001] The invention relates to a method for isomerizing olefins, in particular to a method for skeletally isomerizing post-ether normal olefins, and belongs to the technical field of gasoline production and processing. Background technique [0002] Since the 1980s, global gasoline products have gradually developed in the direction of lead-free, low aromatics, low vapor pressure, high octane number and high oxygen content. Therefore, the international petrochemical market has a strong demand for ether oxygenates, especially methyl The demand for tert-butyl ether (MTBE) and methyl tert-amyl ether (TAME) is increasing rapidly. The main problem in the production of ether oxygenates in my country is the small plant scale and poor economic benefits. One of the important reasons is the insufficient production of isomeric olefins such as isobutene and isopentene as raw materials. From a global perspective, the demand for iso-olefins for the production of ether oxyg...

Claims

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Application Information

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IPC IPC(8): C10G50/00B01J29/68B01J29/65
CPCC10G50/00B01J29/65B01J29/68Y02P20/52
Inventor 徐亚荣陈蓝天许磊龚涛贺春梅樊金龙魏书梅
Owner PETROCHINA CO LTD
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