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Method for preparing low-carbon olefins from oxides

A technology of low-carbon olefins and oxides, applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, dehydration of hydroxyl-containing compounds to prepare ethers, chemical instruments and methods, etc., can solve the problems of low ethylene production and high cost, and achieve increased yield, Good temperature rise, the effect of controlling temperature rise

Active Publication Date: 2017-06-13
JIANGSU TIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents all use refined methanol as a raw material, which has high cost, and the content of propylene in the low-carbon olefins produced by using refined methanol as a raw material is much higher than that of ethylene, and the output of ethylene is low.

Method used

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  • Method for preparing low-carbon olefins from oxides
  • Method for preparing low-carbon olefins from oxides
  • Method for preparing low-carbon olefins from oxides

Examples

Experimental program
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Embodiment 1

[0025] Fusel oil refined from methanol is used, and its composition is shown in Table 1. Fusel oil is pretreated by strong acid cation exchange resin and distillation cutting to remove harmful impurities, and then enters the main reactor after mixing and preheating. Methanol is pre-reacted on a medium-sized fixed-bed reaction device, the inlet temperature of the pre-reactor is 260°C, the outlet temperature is 370°C, and the weight hourly space velocity of refined methanol in the pre-reactor is 2.0. The outlet materials (methanol, dimethyl ether, water) of the pre-reactor are mixed with the pretreated fusel oil and water vapor, and then enter the main reactor after preheating. The weight hourly space velocity of methanol and dimethyl ether in the main reactor is 0.8h -1 , the weight hourly space velocity of fusel alcohol is 0.6h -1 , the total carbon treatment space velocity caused by the addition of the two is equivalent to the methanol weight hourly space velocity of 1.2h -...

Embodiment 2

[0027] Fusel oil from Fischer-Tropsch synthetic water is used, and its composition is shown in Table 2. Fusel oil is pretreated by strongly acidic cation exchange resin and distillation cutting to remove harmful impurities, and then enters the main reactor after mixing and preheating. The refined methanol is pre-reacted on a medium-sized fixed-bed reaction device. The inlet temperature of the pre-reactor is 260°C, the outlet temperature is 370°C, and the weight hourly space velocity of the refined methanol in the pre-reactor is 2.0. The materials (methanol, dimethyl ether, water) at the outlet of the pre-reactor are mixed with fusel alcohol and water vapor, and then enter the main reactor after preheating. The weight hourly space velocity of methanol (and dimethyl ether) in the main reactor is 0.8h -1 , the weight hourly space velocity of fusel oil is 0.5h -1 , the space velocity of the total carbon (including methanol, dimethyl ether, fusel alcohol, etc.) treated in the main...

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Abstract

The invention relates to a preparation technology of chemical raw material low-carbon olefins including ethylene, propylene and the like, and in particular to a method for preparing the low-carbon olefins from oxides. The method comprises the following steps: (1) enabling refined methanol to enter a pre-reactor which is filled with an aluminum oxide catalyst for reacting, wherein a reactor outlet material is an intermediate product containing methanol, dimethyl ether and water; (2) firstly carrying out pretreatment on fusel oil through strong acid cation type exchange resin and distillation cutting, thus obtaining pretreated fusel oil; (3) heating the products which are obtained in the step (1) and the step (2), water and cyclic hydrocarbon through a pre-heating furnace, then entering a main reactor which is filled with a catalyst, and reacting to generate C1 to C8 hydrocarbons based on ethylene and propylene; (4) separating the reactor outlet material obtained in the step (3), and using all or a part of the ethylene and the propylene as a product for outputting; using the other part of reaction products as the cyclic hydrocarbons, and returning the cyclic hydrocarbons to the main reactor for further reacting. The method disclosed by the invention is small in investment, low in cost, easy in reaction control and high in yield.

Description

technical field [0001] The invention relates to the preparation technology of low-carbon olefins such as chemical raw materials such as ethylene and propylene, in particular to a method for preparing low-carbon olefins from oxides. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic raw materials for organic chemical industry. The traditional sources mainly include petroleum routes such as fluid catalytic cracking (FCC) and naphtha steam cracking. In recent years, with the sharp increase in the domestic demand for low-carbon olefins and the increasingly inferior and heavy petroleum resources, the non-petroleum route, especially coal or natural gas as raw material and methanol as an intermediate product to produce ethylene, The method of propylene and other low-carbon olefins has received more and more attention, and the production technology of producing low-carbon olefins from methanol / dimethyl ether has achieved a million-ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCC07C1/20C07C41/09C07C2529/40C07C11/04C07C11/06C07C43/043Y02P20/52Y02P30/20Y02P30/40
Inventor 孙先勇胡思王炜郭兆民
Owner JIANGSU TIANNUO NEW MATERIAL TECH