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Method of dispersing by-products formed in dilution steam systems

A by-product, copolymer technology, applied in the field of dilution steam system, can solve the problems of harmful, accumulated fouling downtime, weak energy efficiency, etc.

Active Publication Date: 2020-08-04
ECOLAB USA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn leads to poor energy efficiency and, in worse cases, downtime due to accumulated fouling
The DSG also suffers from fouling due to by-product carryover, and the QWT also suffers from fouling
Similar fouling and detrimental results were seen for units employing feed saturators instead of dilution steam generators

Method used

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  • Method of dispersing by-products formed in dilution steam systems
  • Method of dispersing by-products formed in dilution steam systems
  • Method of dispersing by-products formed in dilution steam systems

Examples

Experimental program
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Effect test

example 1

[0071] Solutions of the materials of Table 2 (including Polymer 1 ) in the amounts given in Table 2 were prepared in deionized water at a pH ranging from 6 to 10. 10 ml of each solution was placed individually in a test tube, and all test tubes were placed together in an 80°C water bath until the solutions equilibrated at the temperature of the water bath. After equilibration, the pyrolysis gasoline by-product as defined in section [021] was added to the solution in each test tube in the same amount, varying in volume from 0.1 mL to 0.5 mL. The tubes are then agitated mechanically or manually to thoroughly mix the tube contents. Allow the tubes to sit undisturbed in a vertical position on the benchtop. They were checked immediately after mixing and then at 15 minute intervals as they cooled to room temperature. Typically after a total of 60 minutes, the appearance of the mixture in each tube was rated by a visual scale, with a rating of "1" indicating a completely clear mixt...

example 2

[0075] Example 1 was repeated except that the Polymer 2 material was acrylamide (AM) and methacrylamidopropyltrimethylammonium chloride (MAPTAC) in a molar ratio of 39:1AM:MAPTAC ) copolymers. The results are shown in Table 3.

[0076] Table 3. Materials added to process water and resulting clarity ratings.

[0077]

[0078]

example 3

[0080] Example 1 was repeated except using a polymer of the type Polymer 3, which was a PEO-PPO-PEO triblock copolymer having a reported molecular weight of 4200. The results are shown in Table 4.

[0081] Table 4. Materials added to process water and resulting clarity ratings.

[0082]

[0083]

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Abstract

Disclosed herein is a method for reducing fouling caused by process water present in a water circulation loop of a pyrolysis plant. Process water includes water, pyrolysis gasoline, and in some cases pyrolysis gasoline by-products. Fouling is caused by phase separation and accumulation of materials in the process water on equipment surfaces. The method includes applying a total of about 5 ppm to 500 ppm of one or more antifouling polymers to the process water to form treated process water. One or more antifouling polymers are selected from copolymers of unsaturated fatty acids, primary diamines and acrylic acid; copolymers of methacrylamidopropyltrimethylammonium chloride and acrylic acid and / or acrylamide; ethylene glycol and Copolymers of propylene glycol; and blends of two or more thereof.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to US Patent Application Serial No. 62 / 271,667, filed December 28, 2015, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to the use of polymeric dispersants in dilution steam systems of ethylene production plants, such as steam crackers. Background technique [0004] 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 is subjected to intimate contact with process streams, it is often referred to as process water. In ethylene manufacturing plants, steam is contacted with process feedstock to control the pyrolysis (cracking) process by reducing the partial pressure of the hydrocarbon feedstock, improving the efficiency of the shift reaction. Downstream of the pyro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16C10G75/04C07C7/20
CPCC02F5/12C02F5/10C02F2103/365C02F2303/20C02F2303/22C11D3/3765C11D3/3773C11D3/3707C10G9/36C11D2111/20
Inventor 史蒂文·利恩法布里斯·库奥克安东尼·万宰尔杰罗姆·瓦尚拉塞尔·沃森西奥多·阿恩斯特哈维尔·弗洛伦西奥巴斯卡尔·阿卢里
Owner ECOLAB USA INC
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