SU1731799A1 - Method of producing granulated zeolite filler for synthetic detergents - Google Patents

Abstract

Use: manufacture of synthetic detergents. The invention, in an aqueous suspension containing sodium carbonate, sodium silicate and zeolite A, additionally introduces sodium sulfate when mixed. In terms of dry matter, the zeolite filler contains sodium carbonate 11-30, sodium silicate 5-10, sodium sulfate 3-5, zeolite A up to 100% of 1 tab.

Description

The invention relates to the field of granulated zeolite components for synthetic detergents (CMC) and can be used in the chemical industry in the production of CMC.

A granulated phosphate-free filler for CMC is known, including,%: fine zeolite, able to exchange for Ca ions (type B zeolite), 65-80; nitrilotriacetate Na 4-10; nonionic surfactant 1,5-3; alkali - about 1; CMC or methylcellulose 0.5-1.5, water-up to 100.

Also known granulated filler detergent containing,%: zeolite A 70-80; Na2S044-8; nonionic surfactant 2-3; alkali 0-1; CMC and / or methylcellulose 0.5-1; water - up to 100.

Zeolite is obtained from water-soluble silicate and Na aluminate in the presence of water. The resulting aqueous suspension is filtered and used to prepare the filler in a wet state, without drying. The filler does not contain phosphates. A common disadvantage of the described fillers is the low strength of the granules, which leads to technological difficulties in their use, transportation and dosing.

There is also known a method for preparing granular easily flowing components of a detergent, according to which free flowing instant detergent composition with a bulk weight of 600 g / l, containing% oxyethyl 3-20 mol of ethylene oxide C-I2-C24 or other non-ionic oxyalkylated surfactants, is obtained 15 -20; anionic surfactants 51 inorganic fillers such as Tripolyphosphate type Na, zeolite type A, metasilicate NaaCOaa, Na2S04 MgSiOa 40-80; polyphosphonic acids, polycarboxylic acids, sodium toluene sulfonate, CMC, optical bleach 0.5-10; adsorbsl

with

VI s

Vi o o o

National or crystallization water 10-20.

The disadvantage of this method is the production of products containing environmentally harmful phosphorus compounds. It is known that phosphorus compounds contained in CMC, falling into rivers and reservoirs, cause their poisoning (eutrophication) and worsen the ecological situation.

Closest to the present invention is a method for producing a granulated zeolite for a high bulk bulk detergent composition containing carbonates and zeolites. The method includes the following stages: preparation of a suspension containing,%: zeolite 20-60, sodium carbonate 5-30; sodium silicate 5-15; water 25-60 (which, in terms of dry matter, is 36-80.7-55 and 7-38%, respectively); lower viscosity of the mixture; spray drying the mixture with the formation of granules in the form of balls with a moisture content of 2-16%; mixing the obtained granules with a liquid non-ionic surfactant in order to absorb the surfactant on the surface of the granules. A crystalline product of type A or X, having an average particle size of 15 μm in diameter, is used as a zeolite. In this way, CMC is obtained, in which, instead of environmentally harmful phosphorus compounds, an ecologically harmless zeolite is contained.

However, the granulated product obtained in a known manner has a low granule strength (up to 30%). Products with such strength are easily destroyed during processing at CMC equipment in the industry, resulting in clogging of metering devices, lagging and formation of zeolite in the bunker, hauling and supplying are difficult, and the dustiness of workplaces increases.

The aim of the invention is to increase the strength of the granules.

The goal is achieved by the addition of sodium sulfate to the aqueous suspension by mixing in the following ratio of components, wt.%, Calculated on the dry matter;

Sodium carbonate 11-30

Sodium silicate 5-10

Sodium sulfate 3-5

Zeolite ADO 100

The essence of the method is as follows. By mixing sodium carbonate (11-30 wt.%), Sodium silicate (5-10 wt.%), Sodium sulfate (3-5 wt.%) And zeolite A (up to 100%), a suspension is obtained.

finished form containing 25-40 wt.% dry matter.

At the same time provide uniform distribution of components in the mixture and the complete homogenization of the suspension. Zeolite is used in the form of powder, wet cake or suspension. The sodium carbonate is pre-diluted in water heated to 40-60 ° C.

0 The prepared suspension is spray dried and obtained granules with a size of 50-200 microns with a strength of 48-62%,

PRI me R 1. Prepared from 1 kg

5 zeolite NaA zeolite suspension. With stirring, 425 g of sodium carbonate and 141.7 S1O2 of sodium silicate are added to the zeolite suspension containing 88% by weight of water. Weight containing 40% dry

0 substances spray dried. A granular component of synthetic detergents (CMC) is obtained, containing,%: zeolite 60, sodium carbonate 30, sodium silicate 10, (NazOiSidz

5 1: 2,6). Granular product has a strength of 28%.

PRI mme R 2. Prepared from 1 kg of zeolite NaA aqueous suspension and 546.5 g of 46.5% sodium carbonate solution, in

Into a soda solution, 86.3 g of sodium sulfate is introduced. With stirring, a co-sulfate solution is added to a suspension of zeolite containing 70% by weight of water and 126.9 g of SiOa with sodium silicate solution.

5 The resulting mass is spray dried. Get granular component CMC, containing,%; zeolite 67, sodium carbonate 20; sodium silicate 10, sodium sulfate 3, Granules have strength

0 62%.

Example 3: A suspension of 1 kg of zeolite NaA and 914 g of a 46.5% sodium carbonate solution are prepared. 160.5 g of sodium sulfate are added to the soda solution. With stirring, a co-sulfate solution is added to the zeolite suspension containing 65.8% by weight of water and 70.8 g of SiO2 with sodium silicate solution. After homogenization, the mass is spray dried, which is carried out at a rate of 7.5 l / h.

Get granular component containing,%: zeolite 60; sodium carbonate 30; sodium silicate 5; sodium sulfate 5, having a strength of 48%.

PRI me R 4. A water suspension and 252.3 g of a sodium carbonate solution of 46.5% are prepared from 1 kg of NaA zeolite. 96.8 g of sodium sulfate are introduced into the soda solution.

With stirring, a co-sulfate solution is added to a suspension of zeolite containing 64.9% by weight of water and 106.7 g of SiOa with sodium silicate solution. After homogenization, the mass is spray dried at a rate of 7.5 l / h,

Get granular component containing,%: zeolite 75; sodium carbonate 11; sodium silicate 10; sodium sulfate 4 having a strength of 54%.

EXAMPLE 5 An aqueous suspension of zeolite and 860.2 g of a 46.5% sodium carbonate solution are prepared from 1 kg of NaA zeolite. 90.72 g of sodium sulfate is added to the soda solution. With stirring, a co-sulfate solution is added to the zeolite suspension and with a sodium silicate solution, 93.3 g of SI02. after homogenization, the mass is spray dried. Spray slurry flow rate 7.5 l / h. A granular component is obtained for CMC containing,%: zeolite 60; sodium carbonate 30; sodium sulfate 3. Granules have a strength of 50%.

PRI me R 6. Prepare from 1 kg of zeolite NaA aqueous suspension of zeolite. With stirring, 640 g of sodium carbonate and 160 g of SiO2 are added with a solution of sodium silicate to a suspension of zeolite containing 78% by weight of water. After passing through the homogenizer a mass at a rate of 7.5 liters of suspension in 1 hour. A granulated CMC component is obtained, containing,%: zeolite 50; sodium carbonate 40; sodium silicate 10. Granules have a strength of 32%.

Example. An aqueous suspension of zeolite and 95.6 g of a 46.5% sodium carbonate solution are prepared from 1 kg of zeolite NaA. 100.8 g of sodium sulfate is added to the soda solution. With the stirring, a co-sulfate solution is added to the zeolite suspension containing 66% by weight of water.

After homogenization, the suspension is spray dried at a flow rate of 7.5 l / h. Get granular component CMC containing,%: zeolite 90; sodium carbonate 5; sodium sulfate 5. Granules have a strength of 10%.

Analyzing the results of the studies in the table shows (examples 2-5) that the zeolite filler granules for CMC, obtained by the proposed method, by 10-30% higher than the strength of the granules obtained in a known manner. The most optimal ratio of components in the mixture is with, wt.%:

Sodium carbonate 11-30

Sodium silicate 5 -10

Sodium sulfate 3 -5

Zeolite ADO 100

In the absence of sulfate in the mixture (examples 1 and 6), the strength of the granules is significantly reduced. In addition, in the absence of sodium silicate (Example 7), the strength of the granules is also significantly reduced.

Claims (1)

The method of obtaining a granular zeolitic filler for synthetic detergents by preparing a slurry in the slurry by mixing zeolite A, sodium carbonate and sodium silicate, followed by spray drying the slurry to form granules, in order to increase the strength of the granules into an aqueous slurry. when mixed, sodium sulfate is additionally added in the following ratio of components in terms of dry matter: sodium carbonate 11-30 Sodium silicate 5-10 Sodium sulfate 3-5 Zeolite ADO 100 four