Method for separating normal alkane from full fraction naphtha

A technology for n-alkane and naphtha, which is applied in the petroleum industry, adsorption purification/separation, and refined hydrocarbon oil, etc., can solve the problems of affecting the operation cycle, easy coking, affecting the adsorption capacity and adsorption rate of n-alkane, etc. The effect of improving the yield of ethylene and increasing the yield

Active Publication Date: 2006-01-04
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0006] Generally, naphtha fractions contain a certain amount of impurities such as aromatic hydrocarbons and non-hydrocarbon heteroatom compounds. These substances have stronger polarity than alkanes and will be adsorbed on the outer surface of the n-alkane adsorbent 5A molecular sieve, which not only affects The adsorption amount and adsorption rate of n-alkanes, and will be enriched in the desorption liquid during the desorption operation, affecting the purity of n-alkanes
According to the principle of steam cracking to ethylene reaction, aromatics only have dehydrogenation reaction in the cracking process, and do not produce olefin products, which are easy to coke and seriously affect the operation cycle

Method used

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  • Method for separating normal alkane from full fraction naphtha

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example 1

[0031] Take 90 grams of NaA molecular sieve raw powder (produced by Wenzhou Catalyst Factory), 10 grams of kaolin (produced by Wenzhou Catalyst Factory), grind, mix evenly, press into tablets, and roast at 540° C. for 4 hours. With 0.1M calcium chloride solution at 80°C and volumetric space velocity for 2.0 hours -1 Carry out column ion exchange under the conditions of 2 hours, and then dry at 200 ℃ in nitrogen flow for 24 hours, break into 20-40 mesh (0.5-1.5 micron) particles, and obtain adsorbent A, its physical and chemical properties are shown in Table 1 .

example 2

[0033] Take 100 grams of NaA molecular sieve raw powder, use 0.1M calcium chloride solution as the exchange solution, and conduct kettle-type ion exchange twice under the conditions of 80°C and liquid / solid volume ratio of 5:1, each time for 1 hour, to make 5A molecular sieve raw powder, and then made into small balls with a diameter of 0.5-0.8 mm by the oil column drop ball molding method, and roasted at 540 ° C for 4 hours to make Adsorbent B. Its physical and chemical properties are shown in Table 1.

example 3

[0035] The surface area of ​​100 grams is 485 meters 2 Coarse pore chromatography silica gel (produced by Beijing Chemical Plant) with a pore volume of 0.284 ml / g is placed in an adsorption column of φ20×1200 mm, at 25° C., normal pressure, and volume space velocity for 1.0 hour -1 Under certain conditions, the raw naphtha raw material with a boiling range of 40-150°C is pumped into the adsorption column for adsorption operation, and aromatic hydrocarbons are collected to absorb residual oil. After the adsorption is saturated, that is, when the content of aromatics in the effluent of the adsorption column is 1.0% by mass, nitrogen is used as the displacing agent, and the time is 2.0 hours -1 The volume space velocity is passed into the adsorption column to replace the adsorption raw material in the invalid volume of the adsorption column, and the nitrogen gas is passed into the adsorption column for 2 minutes. After the displacement is over, use n-octanol as a desorbent, and ...

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Abstract

The full fraction naphtha is first treated via one adsorption and separation process to separate out arene, and then treated via one other adsorption and separation process to separate normal alkane from non-normal alkane. The naphtha component obtained through adsorption and separation process and with rich normal alkane is used as material for steam cracking equipment to raise the ethylene yield; the component with rich non-normal alkane is used as material for catalytic re-former to increase the yield of reformed gasoline or arene; and the component with rich arene is used as material for coking or reforming apparatus. The two adsorption and separation processes have efficient desorbing agent adopted for regenerating the adsorption saturated adsorbent for reuse.

Description

technical field [0001] The invention is a method for adsorbing and separating normal paraffins, in particular, a method for adsorbing and separating normal paraffins from whole cut naphtha. Background technique [0002] It is estimated that the global demand for ethylene will grow at an annual rate of 4-5% in the next few years, and petrochemical companies will meet the increasing demand for ethylene by transforming existing devices or building new devices. At present, steam cracking is the main means of producing ethylene. More than 50% of the steam cracking units use liquid hydrocarbon raw materials. Among them, the commonly used raw material naphtha is a mixture of various hydrocarbons, which can be cracked into various cracking products, of which only The cracking products of linear alkanes are light alkenes. Therefore, to increase the ethylene yield of the cracking unit, the raw materials used should be mainly n-paraffins. The yield of ethylene in the cracking product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G25/00C07C7/12
CPCY02P30/40
Inventor 姚志龙王德华郁灼张宝贵
Owner CHINA PETROLEUM & CHEM CORP
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