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The preparation method of propylene

A technology for dehydrogenation of propylene and propane, applied in chemical instruments and methods, inorganic chemistry, hydrocarbons, etc., can solve the problems of short catalyst regeneration cycle, high equipment investment and energy consumption, low purity of circulating hydrogen, etc., and achieves low price. , The effect of low equipment investment and low energy consumption

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the low purity of circulating hydrogen in the propane dehydrogenation to propylene technology in the prior art results in low propylene selectivity in propane dehydrogenation reaction, short catalyst regeneration period, and high equipment investment and energy consumption.

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  • The preparation method of propylene
  • The preparation method of propylene

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A 600,000-ton / year propane dehydrogenation to propylene unit (annual operating hours 8,000 hours), usingfigure 1 After the propane dehydrogenation reaction, the gas is compressed to 1.0MPa by a one-stage reciprocating compressor and cooled to 45°C. The gas phase flow enters the adsorption tower for adsorption. There are 4 adsorption towers, and the porous stable state γ-alumina is used for adsorption According to the two basic steps of high-pressure adsorption and low-pressure regeneration switching, repeat the cycle operation, that is, there is always one container in the adsorption state, while the other several are in different regeneration stages, the switching regeneration time is 600 seconds, and the adsorption tower is adsorbed. The pressure is 1.0MPa, temperature 40℃, desorption regeneration pressure 0MPaG.

[0021] The processing capacity of the adsorption tower of the device is 35% of the reaction gas, the diameter of the adsorption tower is 3000mm, the purity ...

Embodiment 2

[0023] A 600,000-ton / year propane dehydrogenation to propylene unit (annual operating hours 8,000 hours), using figure 1 Advanced process technology, the gas after the propane dehydrogenation reaction is compressed to 1.5MPa by a one-stage reciprocating compressor, and cooled to 15°C, the gas phase flow enters the adsorption tower for adsorption, and there are 6 adsorption towers, using 4A molecular sieve as the adsorbent, switching regeneration The time is 360 seconds, the pressure is 1.5MPa when the adsorption tower is adsorbed, and other conditions are the same as in Example 1.

[0024] The processing capacity of the adsorption tower of the device is 20% of the reaction gas, the diameter of the adsorption tower is 2800mm, the purity of hydrogen is 99.9% (volume), the selectivity of propylene in propane dehydrogenation reaction is 91%, the catalyst regeneration cycle is 2 days, and the service life is 2 years. The steam consumption is 28 tons / hour, the electricity consumptio...

Embodiment 3

[0026] A 600,000-ton / year propane dehydrogenation to propylene unit (annual operating hours 8,000 hours), using figure 1 After the propane dehydrogenation reaction, the gas is compressed to 1.0MPa by a one-stage reciprocating compressor and cooled to 15°C. The gaseous phase flow enters the adsorption tower for adsorption. The pressure of the adsorption tower is -0.08MPa when it is desorbed. Other conditions are the same as in the example 1.

[0027] The processing capacity of the adsorption tower of the device is 25% of the reaction gas, the diameter of the adsorption tower is 3000mm, the purity of hydrogen is 99.95% (volume), the selectivity of propylene in propane dehydrogenation reaction is 92%, the catalyst regeneration cycle is 3 days, and the service life is 2 years. The steam consumption is 26 tons / hour, the electricity consumption is 6500kw, and the total investment is about 2 billion yuan.

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Abstract

The invention relates to a preparation method of propylene, which is used for solving the problems that propane dehydrogenation reaction is low in propylene selectivity, short in catalyst regeneration period, high in device investment and energy consumption as circulating hydrogen gas is low in purity in the prior art. In order to solve the problems well, a following technical scheme is adopted as follows: gas-liquid separation is carried out on a propane dehydrogenation reaction gas under conditions with pressure of 0.5 Mpa-1.5 Mpa and a temperature of 0 DEG C-45 DEG C; a separated gas-phase containing hydrocarbons such as a hydrogen gas, propane and propylene passes through a pressure swing adsorption device adopting at least one adsorbent, the high-purity hydrogen gas obtained by separation is partly returned to a reaction system, and the other hydrogen gas is fed to the outside. And therefore, the preparation method can be used for industrial production of the propylene by propane dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing propylene. Background technique [0002] Propylene is an important chemical raw material, mainly used to produce PP, cumene, acrylonitrile, acrylic acid and many other products. At present, the production method of propylene is usually petroleum hydrocarbon steam cracking method. According to statistics, at present, more than 50% of the world's of propylene is produced by this method. Industrially, the cracking temperature of naphtha has been raised to 840-860°C, and the cracking temperature of single-pass small-diameter furnace tubes has been raised to above 900°C. Since the steam cracking technology has been perfected day by day, there is not much room for improvement. The reaction temperature is high, the high-temperature-resistant alloy materials used are expensive, energy consumption is high, coking is easy, and the raw material requirements are harsh (light feedstock oil). Therefore, in recent year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C5/333C07C7/13C07C7/12C01B3/56C01B3/26
CPCY02P20/584
Inventor 刘文杰张洪宇郭毅
Owner CHINA PETROLEUM & CHEM CORP
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