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Double solvent for extracting, distilling and separating styrene in hydrocarbons mixture

A hydrocarbon mixture and composite solvent technology, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of low industrial practical value and high cost, and achieve the effect of reducing polymerization and comprehensive energy consumption

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] GB1,038,606 proposes a method for separating styrene from hydrocarbon mixtures. The method uses fuller's earth to treat hydrocarbon raw materials, and then uses an aqueous solution of silver salt as a solvent for extraction and rectification. The silver salt is Silver nitrate, but the cost of the solvent is high, and the industrial practical value is low

Method used

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  • Double solvent for extracting, distilling and separating styrene in hydrocarbons mixture
  • Double solvent for extracting, distilling and separating styrene in hydrocarbons mixture
  • Double solvent for extracting, distilling and separating styrene in hydrocarbons mixture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] pyrolysis gasoline C 8 The distillate is used as raw material, and its composition is listed in Table 1. according to figure 1 In the process shown, extractive distillation is carried out on the raw material to recover styrene therein, and the purity of the separated styrene is required to be 99.9% by mass, and the recovery rate is 95% by mass. The composite solvent used contains 80% by mass of main solvent sulfolane and 20% by mass of co-solvent p-diethylbenzene, and the relative volatility of o-xylene / styrene of the raw material is 1.65 as determined by experiments. The operating conditions and energy consumption of the extractive distillation tower and solvent recovery tower are shown in Table 2.

example 2

[0036] By the method of example 1 from pyrolysis gasoline C 8 Separation of styrene in the fraction, the difference is that the composite solvent used contains 85% by mass of the main solvent 2-methylpyrrolidone and 15% by mass of co-solvent trimethylene, and the relative volatility of o-xylene / styrene measured by the experiment is 1.67 , See Table 3 for the operating conditions and energy consumption of the extractive distillation tower and the solvent recovery tower when the styrene purity and yield are the same as in Example 1.

[0037] table 3

[0038]

[0039] As can be seen from Table 3, the composite solvent can effectively reduce the temperature at the bottom of the two towers of the extractive distillation tower and the solvent recovery tower, and minimize the polymerization loss of styrene. On the premise of reaching the same product purity and recovery rate, Compared with Comparative Example 1, the operating energy consumption is reduced by 38%.

example 3

[0041] By the method of example 1 from pyrolysis gasoline C 8 Separation of styrene in the fraction, the difference is that the n-butylbenzene containing 60 mass % N-methylpyrrolidone, 15 mass % diethylene glycol and 25 mass % n-butylbenzene in the composite solvent that adopts, wherein main solvent is N-methyl pyrrolidone and Diethylene glycol, cosolvent is n-butylbenzene, and the o-xylene / styrene relative volatility of experimental measurement is 1.67, and the operation of extraction rectification tower, solvent recovery tower is all the same under the situation of example 1 in styrene purity and yield Conditions and energy consumption are shown in Table 4.

[0042] Table 4

[0043]

[0044] As can be seen from Table 4, under the premise of achieving the same product purity and recovery rate, the operating energy consumption of the composite solvent used in the present invention is significantly reduced by 42% compared with Comparative Example 1.

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Abstract

The invention provides a composite solvent for extracting, rectifying and separating styrene from hydrocarbon mixtures. The composite solvent comprises a main solvent accounting for 62 to 90 percent of the total mass and a cosolvent accounting for 10 to 38 percent of the total mass, wherein the main solvent is selected from sulfones compounds, pyrrolidone compounds, glycol compounds or a mixture of any two or three among the compounds, and the cosolvent is selected from C9-C12 aromatic hydrocarbon, amide containing 2 to 6 carbon atoms or the mixture of the aromatic hydrocarbon and the amide. When the composite solvent is used for extracting, rectifying and separating styrene in hydrocarbon mixtures, the temperature of the bottom of an extractive distillation tower and a solvent recovery tower can be effectively lowered, and the comprehensive energy consumption during extraction is reduced.

Description

technical field [0001] The invention relates to a composite solvent for extraction and rectification, in particular to a composite solvent for extracting and rectifying separation of styrene from hydrocarbon mixtures. Background technique [0002] Styrene monomer is an important basic organic chemical raw material, and it is also widely used in coatings, pesticides, and medicine. According to statistics, the steam pyrolysis gasoline by-product of the ethylene cracking unit contains 3-5% styrene. Due to the difference in raw materials for a set of 1 million tons / year ethylene unit, the content of styrene in the pyrolysis gasoline is 20,000-30,000 tons / year . In the existing process of dealing with pyrolysis gasoline, this part of styrene is hydrogenated into ethylbenzene, which is stored in C 8 In the distillate, this ethylbenzene-rich C 8 The distillate is not ideal for supplying the downstream p-xylene unit as raw material. If ultra-rectification is used to separate eth...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C7/08
Inventor 田龙胜赵明唐文成张云明边志凤
Owner CHINA PETROLEUM & CHEM CORP
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