Method for preparing light olefins from methanol using hydrocarbons as part material

A technology for the preparation of low-carbon olefins and methanol, which is applied in the direction of biological raw materials, ethylene production, and hydrocarbon production from oxygen-containing organic compounds. It can solve the problems of increasing energy consumption and reducing the space-time yield of target products, so as to save energy and reduce reaction Thermal effect, effect of reducing dosage

Inactive Publication Date: 2009-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of water is vaporized and condensed during the process, which greatly increases the energy consumption in the process and reduces the space-time yield of the target product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation of embodiment 1 catalyst

[0050] Mix 30.15g of aluminum isopropoxide with 54.17g of water, add 17.11g of phosphoric acid while stirring, continue stirring, add 9.32g of tetraethyl silicate, and finally add 36.19g of 30% tetraethylammonium hydroxide template, Continue stirring to form a homogeneous gel. The above gel solution was transferred into a stainless steel crystallizer, sealed, and left to stand at a constant temperature of 200°C for 120 hours for crystallization. After the crystallization is completed, the product is cooled rapidly, the mother liquor is poured out, the precipitate is separated by centrifugation, and washed several times with pure water until the pH value of the solution is 8-9, and then the obtained crystal is dried at 115°C for 3 hours, 550 The templating agent was removed by calcining at ℃ for 5 hours to obtain SAPO-34 molecular sieve. The obtained SAPO-34 molecular sieve is directly compressed into tablets, and the particle...

Embodiment 2

[0052] On the continuous flow fixed-bed reaction device, 3ml of the catalyst prepared in Example 1 was loaded. Under normal pressure, air flow, flow rate 50ml / min, calcinate the catalyst at 500°C for 2 hours, then switch to N 2 Purge for 0.5 hours. to N 2 It is the carrier gas, the flow rate is 50ml / min, methanol and carbon tetraolefins are used as raw materials, the molar ratio is, methanol: carbon tetraolefins = 1:0.167, and the mass space velocity is 3h -1 , the reaction temperature is 380°C. Table 1 is the raw material composition of carbon tetraolefins. Table 2 shows the results of the methanol-to-olefins reaction when carbon tetraolefins are used as part of the feed.

Embodiment 3

[0060] Using the same catalyst, raw materials, and experimental conditions as in Example 2, the experimental results when the reaction temperatures were 350° C. and 480° C. are shown in Table 3.

[0061] Table 3 The reaction results of C4-olefins as co-feed methanol to olefins

[0062] temperature, ℃ 350 480 Product composition wt% wt% methanol + dimethyl ether 0 0 C1+C2+C3 3.21 8.62 C2＝ 21.58 24.44 C3＝ 32.16 35.21 C4 24.82 16.17 C5+ hydrocarbons 16.93 5.36 Aromatics 0.24 1.56 COx 1.06 8.64

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Abstract

The invention relates to a preparation method of ethylene and propylene, in particular to a method for preparing light olefins in which ethylene and propylene are the primary products and methanol, carbon 4 and the hydrocarbons above carbon 4 are taken as raw material. In the process cracking ethylene and/or dimethyl ether to prepare the light olefins such as ethylene and propylene, part of from carbon 4 to carbon 18 alkane and olefin are added as feedings, and the scission reaction of hydrocarbon which absorbs heat is used for reducing the lot quantity of heat of reaction released from the cracking process of ethylene and/or dimethyl ether, thereby inhibiting the heat effect of the MTO reaction, raising the stability of the reaction system, allowing the operation easier, prolonging the service of catalytic agent, saving energy and reducing cost.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins, in particular to a method for preparing low-carbon olefins with ethylene and propylene as main products by using methanol and hydrocarbons with carbon four and above as raw materials. Background technique [0002] Low-carbon olefins such as ethylene and propylene are the most important basic organic chemical raw materials. With the rapid development of the chemical industry, the demand for low-carbon olefins is increasing. In the current industrial production, the production of low-carbon olefins is basically completely dependent on petroleum resources, and the reduction of petroleum resources worldwide has made the process of producing low-carbon olefins from coal or natural gas through methanol or dimethyl ether more and more difficult. It has received more and more attention at home and abroad. [0003] In 1984, the Mobil Petroleum Company of the United States used the methanol-to-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/02
CPCY02P30/20Y02P30/40
Inventor 张飞张明森柯丽冯静刘莹莹张建华许春梅黄志永
Owner CHINA PETROLEUM & CHEM CORP
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