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Method to inhibit polymerization in process water

A technology of process water and polymerization inhibitors, applied in chemical instruments and methods, treatment equipment corrosion/inhibition of dirt, water pollutants, etc., can solve problems such as harmfulness, device shutdown, low energy efficiency, etc.

Active Publication Date: 2019-04-02
ECOLAB USA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn will lead to low energy efficiency and in worst case plant downtime due to accumulated fouling
DSG also fouls due to by-product cross-contamination, and QWT may also suffer from fouling
Similar fouling and detrimental results can occur for units employing feed saturators in place of dilution steam generators

Method used

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  • Method to inhibit polymerization in process water
  • Method to inhibit polymerization in process water
  • Method to inhibit polymerization in process water

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] The distribution ratio of polymerization inhibitor l-hydroxy-2,2,6,6-tetramethylpiperidinyl-oxyl (HTMPO) between pyrolysis gasoline and water phase was determined by the following steps. HTMPO was added to a mixture of equal volumes of deionized water and simulated pyrolysis gasoline (pygas). Simulated pyrolysis gasoline consists of a mixture of toluene, styrene, cyclohexane, n-hexane and dicyclopentadiene. The inhibitor and liquid phase are used in amounts such that the inhibitor is present in a total concentration of 1.0% by weight based on the weight of the combined phases.

[0063] The system consisting of inhibitor, pyrolysis gasoline phase and water phase was vigorously stirred for 30 minutes and then allowed to stand for another 30 minutes. The immiscible pyrolysis gasoline and water phases are then separated.

[0064] A stock solution of HTMPO in acetonitrile of known concentration was diluted with water / acetonitrile to obtain five different solutions spanning...

example 2

[0072] The partition coefficient of polymerization inhibitor 1,4-dihydroxyl-2,2,6,6-tetramethylpiperidine (HTMPOH) between pyrolysis gasoline and water phase is determined by the same procedure used in Example 1, the difference The trick is to use HTMPOH instead of HTMPO. Table 2 summarizes the data collected during the determination of the partition coefficient of HTMPOH.

[0073] Table 2. Concentration and partition coefficient data of HTMPOH

[0074]

[0075] a Standard uncertainties are given.

example 3

[0077] The partition coefficient of the polymerization inhibitor N,N'-di-sec-butyl-1,4-phenylenediamine (sBuPDA) between pyrolysis gasoline and the aqueous phase was determined by the same procedure used in Example A, except that sBuPDA was used Instead of HTMLPO. Table 3 summarizes the data collected during the determination of the partition coefficient of sBuPDA.

[0078] Table 3. Concentration and partition coefficient data of sBuPDA

[0079]

[0080]

[0081] a Standard uncertainties are given.

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Abstract

Disclosed herein are methods for reducing fouling caused by process water present within a water recycling loop of a pyrolysis plant. Fouling is caused by phase separation and accumulation of materials from the process water on equipment surfaces. The method includes applying a total of about 5 ppm to 500 ppm total of a first polymerization inhibitor and second polymerization inhibitor to the process water to form a treated process water, wherein the first polymerization inhibitor has a pygas-water partition coefficient of about 0.0001 to 9 and the second polymerization inhibitor has a pygas-water partition coefficient of about 1000 to 50000.

Description

technical field [0001] The present invention relates to polymerization inhibitors and methods of using polymerization inhibitors in one or more industrial cracking operations. Background technique [0002] In the production of petrochemicals, water is often used to control various chemical reactions, for example by transferring heat from process streams to quench reactions. When this water comes into intimate contact with process streams, it is often referred to as process water. In an ethylene manufacturing unit, steam is contacted with the process feedstock to control the cracking (cracking) process by reducing the partial pressure of the hydrocarbon feedstock, thereby increasing the efficiency of the conversion reaction. Downstream of the cracking reactor, a water quench tower is further used to cool the gas leaving the main fractionator or transfer line exchanger. [0003] In the cracking process including the ethylene production process, the dilution steam system (Dil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/04C02F1/68C10B43/14C10G9/16C23F15/00
CPCC10G75/04C02F1/68C10B43/14C10G9/16C23F15/00C23F15/005C02F2101/32C02F2103/365C10G2300/1092C10G2300/4075C10G2300/80C10G2400/20C09K8/524C07C4/04C23F14/02
Inventor J·瓦尚A·V·泽尔F·库克S·利恩C·吉塞拉尔斯A·R·尼尔森R·P·沃森
Owner ECOLAB USA INC