JPS5858398B2 - Detergent manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a detergent containing aluminosilicate IJ.

More specifically, in order to convert the alkali component produced as a by-product during the production of sodium aluminosilicate into a substance useful as a detergent component and use it, a reaction mixture of an acidic substance and a silicate, which is a mixture of unreacted Na2O and SiO Regarding a method for producing a detergent containing aluminosilicate, which is characterized by mixing with a substance containing 5i02 in a ratio of 1 to about 2 or more, its purpose is to satisfy both economical and technical aspects. Our goal is to provide an excellent method of manufacturing detergent.

In general, detergents containing sodium aluminosilicate are produced by drying a detergent slurry obtained by mixing natural sodium aluminosilicate or artificially synthesized sodium aluminosilicate with surface-activated auxiliaries and the like.

Generally, when synthetic sodium aluminosilicate is used as a detergent component, sodium silicate and sodium aluminate are reacted in the presence of an excess alkali, and the aluminosilicate is
- IJum is precipitated and separated from the mother liquor containing excess alkali, washed with water and dried to obtain sodium aluminosilicate cum containing water of crystallization, which is then made into a detergent slurry with surfactants and other formulations. The method used is to dry it and use it as a detergent.

However, in this method, because the particle size of sodium aluminosilicate is extremely small, a large amount of dilute alkaline hydroxide solution is produced as a by-product through separation and washing from the slurry of sodium aluminosilicate. The treatment requires a large amount of equipment and expense, which has also delayed the application of synthetic sodium aluminosilicate to detergents.

In order to overcome the uneconomical nature of this conventional method, attempts have also been made to neutralize the crystallization mother liquor with a strong acidic substance such as alkylbenzenesulfonic acid or sulfuric acid to effectively utilize the by-product alkali IJB in the mother liquor. However, in such a method, the aluminosilicate after neutralization may be because the acidic substance reacts directly with the sodium aluminosilicate due to local heterogeneity during mixing and neutralization. It has been found that the calcium exchange ability of sodium silicate decreases, and when it is finally used as a detergent, the cleaning power often decreases, making it impossible to obtain stable and excellent performance.

As a result of various studies, the present inventors have found a method of utilizing the alkaline slurry produced as a by-product during the production of sodium aluminosilicate to overcome the above-mentioned drawbacks, and have formulated sodium aluminosilicate that is the most economical, stable, and has excellent performance. He came to invent a method for manufacturing detergent.

That is, the present invention is a process in which sodium aluminosilicate is produced and crystallized in the presence of an excess of alkali, a slurry containing sodium aluminosilicate and an alkali is a reaction mixture of an acidic substance and silicates, and unreacted Na2O is 5i0
A step of converting an alkaline component into a component useful as a detergent without causing a decrease in the calcium exchange ability of sodium aluminosilicate by mixing it with a SiO2-containing substance having a molar ratio of 1:2 or more, and further as necessary. This is a detergent manufacturing method that includes a step of adding useful substances that can be blended into a detergent to form a detergent slurry, and a drying step.

In the present invention, a reaction mixture of an acidic substance and a silicate, which contains SiO2 with a molar ratio of unreacted Na2O to SiO2 of 1 to about 2 or more, refers to a substance containing SiO2 in which the amount of Na2O per mole of Si02 is about 0.5. S such that mol ~ 0 mol
Refers to substances containing i02, such as alkylbenzene sulfonic acids, sulfuric esters of higher alcohols, sulfuric esters of polyoxyethylene alkyl ethers, and higher fatty acids, which have sulfonic acid groups, sulfuric ester groups, carboxylic acid groups, etc. in the molecule, and sodium Acidic substances that, when made into salts, become surfactants that can be incorporated into detergents, toluenesulfonic acid, xylenesulfonic acid, etc.Acidic substances that, when made into sodium salts, become salts that have solubilizing and anti-caking effects, sulfuric acid, acidic sulfuric acid Inorganic acids, such as sodium, phosphoric acid, acid phosphates, carbon dioxide gas, and sodium bicarbonate, which form sodium salts when neutralized, which are traditionally used as detergent builders;
Inorganic acid salts, triacetic acid, taenoic acid, malic acid, and carboxylic acids that exhibit chelating power for calcium, magnesium, etc., such as polymeric compounds having a large number of carboxyl groups in the molecule, and such A reaction mixture obtained by reacting an acidic substance with an alkali silicate such as sodium metasilicate, powdered sodium silicate, or water glass by adding water as necessary, and reacting an amount of Na2O to completely neutralize the acidic substance. It is an alkaline, neutral or acidic substance in which the molar ratio of unreacted Na2O to S102 excluded from the total Na205+ in the mixture is 1 to about 2 or more.

These reaction mixtures can be made into a solid state by heating and drying, and can be made into a solid state, such as finely powdered silica, silica gel, colloidal silica aqueous solution, powdered sodium silicate,
It is also possible to use a silicic acid component such as water glass with this reaction mixture if necessary.

Example I Solids content 6 in a heatable reaction vessel equipped with a strong stirring device
7φ sodium aluminate 290g caustic soda 33
9 Add 401 parts of water and heat to about 50°C after sufficiently dissolving.

A JI83 Keiso Keiso 401 at about 50° C. was added to the mixture under strong stirring and stirring was continued for 30 minutes.

The obtained gel-like substance is heated to 90 to 100°C to generate crystals, and then cooled.

A reaction mixture obtained by gradually adding 350 g of a linear alkylbenzenesulfonic acid under cooling to 1310 g of an aqueous sodium silicate solution having a solid content of 610.8% and a molar ratio of Na20:Si02 of 1:3.2 while stirring. is added to the above sodium aluminosilicate slurry while stirring.

The pH of the slurry produced was 12.2 in one cup solution of sodium aluminosilicate.

The calcium exchange capacity of sodium aluminosilicate obtained by removing the activator and silicates by washing with water is 281■-Ca
COa/g-anhydride.

100 g of sodium carbonate, 1,500 g of anhydrous sodium sulfate, 36 g of carboxymethylcellulose, and 365 g of sodium tripolyphosphate were added to the slurry obtained above, and after dissolving, it was dried with a spray dryer.

The resulting detergent was heated to a water hardness of 50 pμ (Ca CO3 equivalent).
A detergency test was conducted using hard water with a detergent concentration of 0.085 wt/Vo 1%, and it showed excellent detergency.

Example H A sodium aluminosilicate suspension obtained in the same manner as in Example I was mixed with 1:3 Na2O:SiO2 at a solid content of 13.3%.
．． A reaction mixture obtained by adding 210 g of linear alkylbenzenesulfonic acid to 1280 g of the sodium silicate aqueous solution of No. 2 was added, and after thorough stirring, a portion of the resulting slurry was washed with water to collect the recovered sodium aluminosilicate. Calcium exchange capacity was 278 - CaC037 g - anhydrous.

Comparative Example A sodium aluminosilicate solution prepared in the same manner as in Example I was neutralized with 50% sulfuric acid, a portion was extracted and washed with water.The calcium exchange capacity of the sodium aluminosilicate was 246■CaCO3/i-anhydrous. It was a thing.

Further, the calcium exchange capacity of sodium aluminosilicate, which was neutralized with a linear alkylbenzenesulfonic acid and then treated in the same manner, was 2511% l-CaCO3/9-anhydride.

As explained in Examples 1 and 2, it can be seen that the sodium aluminosilicate obtained by the present invention has excellent calcium exchange ability.

Claims (1)

[Claims] 1 A reaction mixture of a slurry containing sodium aluminosilicate and sodium hydroxide, one or more compounds selected from alkylbenzene sulfonic acid, sulfuric acid ester of higher alcohol, and sulfuric ester of polyoxyethylene alkyl ether and silicates, which is not yet Reaction Na2O vs S
1. A method for producing a sodium aminosilicate-containing detergent, which comprises mixing a substance containing Si02 with a molar ratio of t02 of 1 to about 2 or more.