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Process for rectifying raw styrene

A technology of crude styrene and styrene, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problem of high loss of styrene, and achieve the effect of reducing loss, good technical effect, and reducing speed

Inactive Publication Date: 2005-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem of polymerization loss of styrene in the crude styrene separation tower that is not involved in the existing literature and the problem of more styrene loss due to styrene self-polymerization in existing industrial devices, and to provide a new crude styrene distillation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The crude styrene feed liquid is composed of the following components with the following mass flow rates: benzene 13.86 kg / h, toluene 59.68 kg / h, non-aromatic 2.78 kg / h, ethylbenzene 1345.85 kg / h, styrene 2533.7 kg / h, p-xylene 0.35 kg / h, m-xylene 0.17 kg / h, o-xylene 0.03 kg / h, cumene 0.02 kg / h, α-methylstyrene 4.91 kg / h, heavy component 65.80 kg / h, polymer 57.49 kg / hr and water 4.17 kg / hr. The crude styrene raw material liquid enters the middle of the crude styrene separation tower. The crude styrene separation tower is a packed tower with a total of 80 trays, of which the rectification section is 27 trays, the pressure at the top of the column is 12KPa, and the temperature at the top of the column is 71 ℃, the pressure of the tower still is 21KPa, the temperature of the tower still is 96 ℃, the reflux ratio of the reflux liquid at the top of the tower is 7.6, the temperature of the reflux liquid is 45 ℃, and the mass flow rate of the top material of the crude styrene ...

Embodiment 2

[0015] Press the condition and step of embodiment 1, just change the tower top pressure to be 15KPa, the tower top temperature is 75 ℃, the tower still pressure is 24KPa, the tower still temperature is 99 ℃, the tower top reflux liquid reflux ratio is 8.0, and the reflux liquid temperature is At 50°C, the total number of trays in the crude styrene separation tower is 70, the rectification section is 22 trays, the weight percentage concentration of styrene in the top material of the crude styrene separation tower is 1.63%, and the loss of styrene polymerization is 6.1 kg / t styrene product.

Embodiment 3

[0017] Press the condition and step of embodiment 1, just change the tower top pressure to be 10KPa, the tower top temperature is 65 ℃, the tower still pressure is 18KPa, the tower still temperature is 90 ℃, the tower top reflux liquid reflux ratio is 7.0, and the reflux liquid temperature is At 40° C., the weight percentage concentration of styrene in the top material of the crude styrene separation tower is 0.74%, and the styrene polymerization loss is 2.8 kg / ton of styrene product.

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Abstract

The present invention relates to a rectification method of crude styrene, and is aimed at mainly resolving the problem of that the utilziation of existent industrial equipment can easily produce self-polymerization of styrene and result in excessive loss of styrene. Said invention adopts the technical scheme of that the tower top pressure of the crude styrene separation tower can be reduced to 7-18 KPa, the temp. of tower top is 60-80 deg.C, the pressure of tower body is 16-27 KPa, temp. of tower body is 85-104 deg.C and its operation reflux ratio of 7-12 so as to resolve said problem. Said invention can be used in the industrial production equipment for styrene separation.

Description

technical field [0001] The present invention relates to a crude styrene rectification method. Background technique [0002] Styrene is widely used as a raw material for the production of various resins, plastics and elastomers, and its wide range of applications is mainly due to the ease of styrene polymerization (eg to polystyrene) or copolymerization (eg with butadiene to production of rubber). [0003] The production of styrene is well known in terms of the dehydrogenation process and the various catalysts used in the process. The main research objective at present is to improve the efficiency of the process. Particularly known is a process for the dehydrogenation of ethylbenzene in which the dehydrogenation is carried out in a set comprising at least two dehydrogenation reactors connected in series and placed between the reactors in which the reaction effluent is exchanged heat with steam and is heated in a heating device. The operating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04C07C15/46
Inventor 邵百祥沈伟张忠群毛连生
Owner CHINA PETROLEUM & CHEM CORP
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