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Kraft pulp mill scale control with end group modified polycarboxylates

A technology of polycarboxylic acid chains and end groups, which is applied in pulping with inorganic alkali, pulping with organic solvents, papermaking, etc., and can solve the problem of evaporator loss of efficiency

Pending Publication Date: 2022-02-25
SOLENIS TECH CAYMAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These salts are water soluble but at the high end can cause evaporators to lose efficiency quickly, especially in the event of material crystallization occurring every few days

Method used

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  • Kraft pulp mill scale control with end group modified polycarboxylates
  • Kraft pulp mill scale control with end group modified polycarboxylates
  • Kraft pulp mill scale control with end group modified polycarboxylates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment C1

[0044] Example C1 - Phosphonate group

[0045] The chelating agent or scale inhibitor in Example C1 is the phosphonate chelating agent DETPMPA, namely diethylenetriaminepenta(methylenephosphonic acid) sodium salt.

Embodiment C2

[0046] Example C2 - Sulfonate group

[0047] The chelating agent of embodiment C2 is polyacrylate prepared using sodium metabisulfite as an initiator. This leaves the sulfonate end groups. Molecular weight is about 2.5 times of the chelating agent molecular weight of embodiment 1a. It is commercially available from Solenis LLC.

Embodiment C3

[0048] Example C3-Hydroxy

[0049] The chelating agent of Example C3 is a polyacrylate prepared using isopropanol as a chain transfer agent, leaving alcohol end groups. The molecular weight is approximately equal to that of the chelating agent of Example 1a. It is commercially available from Lubrizol Corp.

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Abstract

Scale build-up on metal surfaces of a black liquor evaporator is prevented or mitigated by treating the black liquor with a deposit inhibiting concentration of a water-soluble polymer containing a polycarboxylate chain and a 3-mercaptopropionic acid end group.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application Serial No. 62 / 869,235, filed July 1, 2019, the disclosure of which is incorporated by reference. technical field [0003] In general, the present disclosure relates to scale control in the Kraft process for papermaking, and more particularly to antiscalants for use in black liquor concentration processes. [0004] Background of the invention [0005] The kraft pulping process is one of the main pulping processes in the pulp and paper industry. Waste liquor (black liquor or "BL") from the kraft pulping process contains various organic substances and inorganic salts, the deposition of which interferes with effective chemical recovery cycles. Inorganic pulping chemicals and energy are recovered by incinerating BL in a recovery boiler. For efficient combustion in the recovery furnace, the BL from the pulp digester, which has a relatively low solids concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/20C04B24/04C08F22/26
CPCD21C11/0092D21C11/106D21C3/02D21C9/008
Inventor D·J·尼科尔森K·N·贝克伊维
Owner SOLENIS TECH CAYMAN
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