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Composition for inhibiting calcium salt scale formation

A composition, calcium salt technology, applied in the direction of preventing corrosion/sediment formation of pulping equipment, regeneration of pulping liquid, descaling and water softening, etc., can solve problems such as not improving calcium carbonate inhibition

Active Publication Date: 2012-04-25
伊塔尔麦奇化学股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using higher concentrations of such products did not improve calcium carbonate inhibition

Method used

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  • Composition for inhibiting calcium salt scale formation
  • Composition for inhibiting calcium salt scale formation
  • Composition for inhibiting calcium salt scale formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] The scale inhibiting composition consisted of the sodium salt of ethylenediaminetetramethylenephosphonic acid as the first component and carboxymethyl inulin having a DS of 2.5 as the second component.

[0096] METHODS: Kraft cooking was performed in a MK Systems (Danvers, Massachusetts) 6L digester with an extractor port and condenser added to the digester to allow the sample to be pulled while the system was under pressure. Conditions used in Kraft cooking included a 5:1 liquor to wood ratio, 18.5% available alkali, 25% sulfidation and varying levels of Na 2 CO 3 , and 5g / L as the most commonly tested concentration. 10% (v / v) H before each Kraft cooking 2 SO 4 The aqueous solution was circulated in the digester for 10 minutes to remove any sediment present. The acid solution was drained and the digester was rinsed several times with deionized water. Add 4 L of white liquor (as above) to the digester and record the initial temperature. 800 g of oven dried pine ch...

Embodiment 2

[0101] The scale inhibiting composition consisted of the sodium salt of 1-hydroxyethylidene (1,1-diphosphonic acid) as the first component and carboxymethyl inulin with a DS of 2.5 as the second component.

[0102] Method: same as Example 1. result in image 3 shown in .

[0103] As can be clearly seen from the laboratory test data and factory test results described in the examples, the mixed product is composed of the specific organometallic phosphonate component of the present invention and carboxylated fructan components, when combined with excluding fruit Calcium carbonate inhibition was increased by at least 20% when compared to the product of the glycan fraction. Furthermore, the test data demonstrate comparable performance at levels between 50 ppm and 100 ppm when the organometallic phosphonate component is combined with the carboxylated fructan component. This result indicates that if a decrease in performance was observed when the dosage was increased, then due to ...

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Abstract

A method for inhibiting the formation, deposition and adherence of calcium salt scale to metallic and other surfaces in the equipment, vessels and / or piping of a chemical pulp process facility comprising adding an effective scale inhibiting amount of a composition to the alkaline aqueous mixture in the digester of said chemical pulping process. Said composition consists of at least one phosphonate component (I) and at least one component (II) consisting of at least one carboxylated fructan compound.

Description

technical field [0001] The present invention relates to compositions and methods for inhibiting fouling in aqueous alkaline systems of chemical pulping processes. The terms "scale", "calcium scale" and "calcium scale" as used in the specification and claims of this application always include but are not limited to calcium scale and magnesium scale, mainly their carbonates and Sulfates, and any and all scales consisting of insoluble salts formed in the processes described in this application, and the term "scale" refers to "scale" (mainly "calcium scale" and "calcium-salt scale" as described above ")Formation. The present invention further relates to compositions and methods for inhibiting the formation, deposition and adhesion of calcium and magnesium scale deposits in chemical pulping processing equipment. More particularly, the present invention relates to methods for inhibiting the formation, deposition and adhesion of calcium and magnesium scale deposits in pulp digester...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/12C02F5/14D21C3/22D21C11/10D21C9/08
CPCD21C11/106C02F5/125D21C9/008C02F5/14D21C9/08Y10S210/928C02F5/10D21C3/226C02F5/145C02F2103/28D21C9/086C02F5/12D21C3/22D21C11/10
Inventor 谢尔登·菲利普·弗雷德
Owner 伊塔尔麦奇化学股份公司
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