CN103808893A

CN103808893A - Method for testing descaling performance of DTPA (Diethylene Triamine Pentacetate Acid) and EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt compounded descaling agent

Info

Publication number: CN103808893A
Application number: CN201210484123.8A
Authority: CN
Inventors: 唐丽华
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-13
Filing date: 2012-11-13
Publication date: 2014-05-21

Abstract

The invention discloses a method for testing the descaling performance of a DTPA (Diethylene Triamine Pentacetate Acid) and EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt compounded descaling agent. The method comprises the steps: (a) firstly, selecting a plurality of experimental containers, cleaning and drying for later use; (b) preparing a DTPA solution and an EDTA disodium salt solution; (c) then, adding a certain amount of barium scale into each experimental container; (d) adding a different proportion of DTPA solution and EDTA disodium salt solution into each experimental container, and adjusting the pH value to 6-10; (e) heating the experimental containers respectively in water baths with the temperature of 50-90 DEG C; (f) respectively calculating the descaling ratio of the DTPA and EDTA disodium salt compounded descaling agent through experimental results, and analyzing the descaling performance of the DTPA and EDTA disodium salt compounded descaling agent through calculation results. The method has the advantages that the descaling performance of the DTPA and EDTA disodium salt compounded descaling agent can be tested quickly, the test results are accurate, the test steps are simple, and the test cost is lowered greatly.

Description

The scale removal performance test methods of DTPA and the composite scale remover of EDETATE DISODIUM

Technical field

The present invention relates to the scale removal performance test methods of a kind of DTPA and the composite scale remover of EDETATE DISODIUM.

Background technology

Scale remover is a kind of incrustation scale of removing, and the chemicals of the multiple dirt stain such as dirt, generally forms by various ingredients is composite.Industrial scale remover is mainly used in removing heat transmission equipment, the dirt in boiler etc.

The conventional kind of scale remover and feature thereof:

(1) inorganic polyphosphate.This type of is the scale remover using the earliest, has limited use abroad.In its molecule, there is the P-O-P key of one or more repetitions to exist, can be divided into chain Quadrafos and cyclic polyphosphates.The shortcoming of inorganic polyphosphate is that moisture-sensitive hydrolysis generates orthophosphate, under high temperature and high pH value, more so, reacts and fouling as Ca2+, Mg2+ etc. with bivalent cation.

(2) organophosphate.The machine phosphate of common are has monoalkyl phosphoric acid esters, bisalkyl phosphate, pyrophosphate, polyoxyethylene aliphatic ether phosphate etc.In organophosphate, P-O-C key is stronger than phosphate P-O-P key, and therefore it is than phosphate-stabilized, and hydrolysis temperature is higher than phosphate.Seemingly, when use, consumption is unsuitable too high for the much character of phosphate and phosphoric acid salt, the too high dirt that easily generates on the contrary.Phosphate easily adheres to equipment surface, good with the compatibility of corrosion inhibiter etc., but easily there is emulsification with oils, so need to add non-emulsifier while use in oil field, hydrolysis phenomenon that can be resemble inorganic polyphosphate in the time that temperature exceedes 90 ℃, its hydrolysate also can react and fouling with divalent metal.Strontium sulfate white crystalline powder.Odorlessness.1g is dissolved in about 8800ml water, 700ml 3% nitric acid, 800ml 2% hydrochloric acid, is slightly soluble in alkali chloride solution, concentrated acid, is insoluble to ethanol and dilute sulfuric acid.Relative density 3.96.1605 ℃ of fusing points.Index of refraction 1.624.

(3) organic multicomponent phosphonic acids.C-P key in phosphonic acids is firm, therefore has higher chemical stability and thermal stability, also difficult hydrolysis under high temperature, high pH value condition, nontoxic or low toxicity.For example ethylenediamine tetraacetic methene phosphoric acid still can keep its activity under the high temperature of 200 ℃ and 1013kPa; Carboxyl ethylene-diphosphonic acid just decomposes under the high temperature of 250 ℃.Such scale remover is effective, and dosing is little, and has corrosion inhibition concurrently.Be widely used in oil field water treatment.

(4) aminopolycanboxylic acid's salt.Aminopolycanboxylic acid's salt is a kind of scale remover of better heat stability, as the serviceability temperature of EDTA can reach 200 ℃.This type of scale remover is mainly that the amount therefore adding is many by huge legendary turtle cooperation antiscale, and cost is high, so use and be restricted in the industrial process of a large amount of waters.

EDETATE DISODIUM Chinese disodium ethylene diamine tetraacetate, white crystalline powder, can be water-soluble, is dissolved in hardly ethanol, ether, and its pH value of water solution is about 5.3; As complexing agent, calcium, magnesium and other metal reagents, metal shadowing agent, disodium ethylene diamine tetraacetate is a kind of important complexing agent, for complexation of metal ions and separating metal.

DTPA usually uses as scale remover, and its Chinese name is diethyl pentetic acid, proterties: white crystal, be dissolved in hot water and aqueous slkali, and be slightly soluble in water, be insoluble to the organic solvent such as alcohol and ether; 230 ℃ of fusing points (decomposition), solubleness in water (20 ℃) 5g/L.Irritant, avoid sucking, avoid entering eyes; Purposes: efficient intercalating agent, closing property of huge legendary turtle is strong, is applied to color inhibitor in acrylic fiber production process, paper industry, water softener, textile auxiliary, huge legendary turtle is closed titrant etc.

Summary of the invention

The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the scale removal performance test methods of a kind of DTPA and the composite scale remover of EDETATE DISODIUM is provided, the method can test out the scale removal performance of DTPA and the composite scale remover of EDETATE DISODIUM fast, and test result is accurate, testing procedure is simple, greatly reduces testing cost.

Object of the present invention is achieved through the following technical solutions: the scale removal performance test methods of DTPA and the composite scale remover of EDETATE DISODIUM, comprises step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) prepare DTPA solution and EDETATE SODIUM salt solusion; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add DTPA solution and the EDETATE SODIUM salt solusion of different proportion respectively, and to regulate its pH value be 6～10; (e) water-bath that experiment container is placed in respectively to 50 ℃～90 ℃ of temperature is heated: (f) result by experiment, calculate respectively the descaling rate of DTPA and the composite scale remover of EDETATE DISODIUM, by result of calculation, analyze the scale removal performance of DTPA and the composite scale remover of EDETATE DISODIUM.

Described experiment container is beaker.

The concentration of described scale remover DTPA solution is 60mg/l.

The temperature of described water-bath is 70 ℃.

The described water-bath time is 16h.

Described pH value is adjusted to respectively 8.

In sum, the invention has the beneficial effects as follows: can test out fast the scale removal performance of DTPA and the composite scale remover of EDETATE DISODIUM, and test result is accurate, testing procedure is simple, greatly reduces testing cost.

Embodiment

Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.

Embodiment:

A kind of DTPA the present invention relates to and the scale removal performance test methods of the composite scale remover of EDETATE DISODIUM, comprise step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) prepare DTPA solution and EDETATE SODIUM salt solusion; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add DTPA solution and the EDETATE SODIUM salt solusion of different proportion respectively, and to regulate its pH value be 6～10; (e) water-bath that experiment container is placed in respectively to 50 ℃～90 ℃ of temperature is heated: (f) result by experiment, calculate respectively the descaling rate of DTPA and the composite scale remover of EDETATE DISODIUM, by result of calculation, analyze the scale removal performance of DTPA and the composite scale remover of EDETATE DISODIUM.

Described experiment container is beaker.

The concentration of described scale remover DTPA solution is 60mg/l.

The temperature of described water-bath is 70 ℃.

The described water-bath time is 16h.

Described pH value is adjusted to respectively 8.

The experimental result recording by said method is as shown in the table:

As seen from the above table: the 1 pair of effect of removing barium sulfate scale of filling a prescription is best, i.e. 50mg/L, the DTPA of 100ml and 50mg/L, when 100mlEDTA disodium salt solution is composite, its descale effect the best.And correlation data, 13 formulas that DTPA and EDETATE SODIUM salt solusion are composite, during generally than independent use DTPA or EDETATE DISODIUM scale removal, descale effect obviously improves, but composite effect differs, and explanation and concentration and consumption have compared with Important Relations.

The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.

Claims

The scale removal performance test methods of 1.DTPA and the composite scale remover of EDETATE DISODIUM, is characterized in that, comprises step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) prepare DTPA solution and EDETATE SODIUM salt solusion; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add DTPA solution and the EDETATE SODIUM salt solusion of different proportion respectively, and to regulate its pH value be 6～10; (e) water-bath that experiment container is placed in respectively to 50 ℃～90 ℃ of temperature is heated: (f) result by experiment, calculate respectively the descaling rate of DTPA and the composite scale remover of EDETATE DISODIUM, by result of calculation, analyze the scale removal performance of DTPA and the composite scale remover of EDETATE DISODIUM.
2. the scale removal performance test methods of DTPA according to claim 1 and the composite scale remover of EDETATE DISODIUM, is characterized in that, described experiment container is beaker.
3. the scale removal performance test methods of DTPA according to claim 1 and the composite scale remover of EDETATE DISODIUM, is characterized in that, the concentration of described scale remover DTPA solution is 60mg/l.
4. the scale removal performance test methods of DTPA according to claim 1 and the composite scale remover of EDETATE DISODIUM, is characterized in that, the temperature of described water-bath is 70 ℃.
5. the scale removal performance test methods of DTPA according to claim 1 and the composite scale remover of EDETATE DISODIUM, is characterized in that, the described water-bath time is 16h.
6. the scale removal performance test methods of DTPA according to claim 1 and the composite scale remover of EDETATE DISODIUM, is characterized in that, described pH value is adjusted to respectively 8.