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Process for preventing self-polymerization or co-polymerization of C5 diolefins in separation process of petroleum C5 distillate

A technology for petroleum carbon five fractions and separation process, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the problem that the polymerization inhibitor is not very suitable, and achieve good polymerization inhibition effect

Inactive Publication Date: 2005-11-23
SINOPEC SHANGHAI PETROCHEMICAL CO LTD +1
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  • Abstract
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Problems solved by technology

In addition, compounds such as hydroxylamines, diamines, oximes and alcoholamines are often used as inhibitors to inhibit the polymerization of olefins in petroleum processing, but considering the use of inhibitors in the existing C5 It should be easy to be separated during the separation process of the parts, so as not to affect the quality of the final separated product. These existing polymerization inhibitors are not very suitable

Method used

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  • Process for preventing self-polymerization or co-polymerization of C5 diolefins in separation process of petroleum C5 distillate

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Embodiment 1～10

[0012] 1. Preparation of polymerization inhibitor

[0013] The required amount of component A diethylhydroxylamine and component B tert-butyl catechol are dissolved in a solvent to prepare a polymerization inhibitor for later use, and the total content of component A and component B is controlled to be 30-40 wt%. The specific solvents used in each embodiment and the weight ratio of component A to component B are listed in Table 2.

[0014] 2. Sealing test of polymerization inhibitor

[0015] Fill a 500ml plastic bottle with 450ml carbon five fraction sample. The sample components are shown in Table 1. Then add the polymerization inhibitor prepared in each of the above embodiments into the plastic bottle in the required amount. A rusty iron nail is placed in a 30ml glass tube, and then a 15ml carbon five sample is taken out of the plastic bottle and injected into the glass tube and sealed. Place the sealed tube in a constant temperature oil bath at 120°C for 20 hours, take it out f...

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Abstract

The invention provides a process for preventing self-polymerization or co-polymerization of C5 diolefins in separation process of petroleum C5 distillate, which consists of charging polymerization inhibitor into C5 distillate material, and making the polymerization inhibitor maintain a finite amount in the C5 distillate material, the polymerization inhibitor comprises composition A: diethylhydroxylamine, and composition B: tert-butyl pyrocatechol, the weight ratio of the composition A and the composition B being (0.5-6):1, the quantity of polymerization inhibitor in the C5 distillate material is sustained at 30-600ppm calculated on the total amount of the composition A and the composition B. The invention can realize better polymerization inhibiting effect, and no extra separation process is needed in the current C5 distillate separation procedure.

Description

Technical field [0001] The invention relates to a method for inhibiting the self-polymerization or copolymerization of conjugated diolefins, in particular to a method for inhibiting the self-polymerization or copolymerization of carbon five diolefins by adding a polymerization inhibitor to the carbon five fraction material during the separation process method. Background technique [0002] In the process of petroleum cracking to produce ethylene, a considerable amount of carbon five fraction is produced by-products. The carbon five fraction contains about 40-60% of diolefins such as isoprene, cyclopentadiene and piperylene. These diolefins The chemical properties are active and it is an important raw material for many fine chemical products. Therefore, the separation and utilization of the C5 fraction is of great significance for improving the economic benefits of the ethylene plant and the comprehensive utilization of petroleum resources. However, the C5 fraction is composed of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/173
Inventor 陈国忠赵金男吴忠平潘奇艳宋建平
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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