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Polymerization inhibitor for inhibiting diolefin polymerization in petroleum cracking C5 fraction

A carbon five fraction and petroleum cracking technology, applied in the field of polymerization inhibitors, can solve the problem that the polymerization inhibitor is not very suitable, and achieve the effects of inhibiting self-polymerization or copolymerization, reducing production costs, and improving polymerization inhibition effect.

Inactive Publication Date: 2010-09-08
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering the above points, the above-mentioned inhibitors are not very suitable

Method used

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  • Polymerization inhibitor for inhibiting diolefin polymerization in petroleum cracking C5 fraction
  • Polymerization inhibitor for inhibiting diolefin polymerization in petroleum cracking C5 fraction

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Embodiment 1～15

[0013] 1. Preparation of polymerization inhibitor

[0014] Weigh component 1, o-methylhydroquinone; component 2, 4-hydroxy-2,2,6,6-tetramethylpiperidine nitroxide; component 3, N-isopropyl Hydroxyl ammonium, and dissolved in solvent acetonitrile, dimethylformamide or N-methylpyrrolidone, control component 1, o-methylhydroquinone; component 2, 4-hydroxyl-2,2,6, 6-tetramethylpiperidine nitroxide free radical; component 3, N-isopropyl hydroxylammonium, the total content of the three components is between 5 and 20 wt%. The specific weight ratios and solvents of component 1, component 2 and component 3 in each embodiment are shown in Table 2.

[0015] 2. Evaluation test of polymerization inhibitor

[0016] Add 230ml of petroleum cracking carbon five fractions to five 250ml pressure bombs respectively, and then use a syringe to add the prepared polymerization inhibitor to carbon five according to the required amount, and weigh them; The blank sample of polymerizing agent was weig...

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Abstract

The invention relates to a polymerization inhibitor for inhibiting diolefin polymerization in a petroleum cracking C5 fraction, which consists of a component 1, a component 2 and a component 3, wherein the component 1 is o-methyl-hydroquinone; the component 2 is 4-hydroxy-2,2,6,6-tetramethyl piperidine nitronyl nitroxide radical; the component 3 is N-isopropyl hydroxylamine; a solvent is acetonitrile, dimethyl formamide or N-methyl-pyrolidone; the weight ratio of the component 1 to the component 2 to the component 3 is 1:0.2-8:0.3-5; and the content of the component 1, the component 2 and the component 3 in the solvent is between 5 and 20 weight percent. The polymerization inhibitor can effectively inhibit diolefin auto polymerization or polymerization in a separating tower in the petroleum cracking C5 fraction and avoids blockage of a reboiler. The dosage of the polymerization inhibitor is small so as to reduce the production cost. The selected solvent is the same with the solvent used for extractive distillation so as to avoid inducing other impurities. The boiling points of various components of the polymerization inhibitor are very different from that of the petroleum cracking C5 fraction, so the separation is easy.

Description

technical field [0001] The invention relates to a polymerization inhibitor for inhibiting the polymerization of diolefins in C5 fractions of petroleum cracking, in particular to a polymerization inhibitor for inhibiting the polymerization of diolefins in the separation process of diolefins in C5 fractions of petroleum cracking. Background technique [0002] C5 distillate is a by-product in the process of cracking ethylene in petrochemical refining units, catalytic cracking units and heavy hydrocarbon cracking units. It is a chemical basic raw material with potential value, and a series of high value-added chemical products are produced through it. Thereby reducing the cost of ethylene production and improving the economic benefit and competitiveness of the enterprise. In the comprehensive utilization of C5 fractions, the three diolefins with the most utilization value are isoprene, piperylene and (bis) cyclopentadiene, whose content accounts for about 45-55% of the total C5 ...

Claims

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Application Information

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IPC IPC(8): C07C7/20C07C11/18C07C11/20C07C13/15
Inventor 任海伦李正李江利韩小平程延华
Owner PETROCHINA CO LTD
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