JPH01289899A - Aqueous zeolite slurry composition - Google Patents

Abstract

PURPOSE:To improve suspension stability and fluidity by blending zeolite and a carboxymethyl ether salt of starch lees. CONSTITUTION:Starch lees prepared from a sweet potato, a potato, etc. are etherified by an etherifying agent (e.g., monochloroacetic acid) in the presence of an alkali, thereby obtaining a carboxymethyl ether salt of starch lees (a). 0.05-5wt.% component (A) is added to an aq. zeolite slurry (B) contg. 40-55wt.% zeolite having a particle size of 2-10mum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an aqueous zeolite slurry composition with excellent suspension stability and fluidity.

[Prior Art] Traditionally, tripolyphosphate has been used as a raw material for detergents, but the problem has arisen that the wastewater after using detergents can eutrophicate rivers, lakes, and blocked seawater. Zeolites are used in place of tripolyphosphate in detergent manufacturing.

In the manufacture of detergents, if zeolite is used as a powder, it will cause various problems when adding it to the formulation.
It is often used as an aqueous slurry with a ffi amount of %.

"Problems to be Solved by the Invention" However, the specific gravity of zeolite is 2.3 to 2.4, and even if it is dispersed alone in water, it will precipitate in a short period of time.

Conventionally, water-soluble polymers such as CMC1 carboxymethyl starch, polyvinyl alcohol, and polyacrylamide have been used as dispersants as stabilizers for aqueous zeolite slurries where stable zeolite slurries cannot be obtained. An experiment was conducted to examine the effects of each of the above-mentioned dispersants using 4A type zeolite with a particle size of 2 to 4 pm obtained by a conventional method.

Among these zeolites, each aqueous slurry obtained using a zeolite having a particle size of 4#Lm or more will form a transparent aqueous solution at the top of the slurry when left to stand for more than a week, and relatively large particles of zeolite will form at the bottom of the slurry. A thick slurry or gel cake formed upon precipitation. Therefore, when manufacturing equipment is shut down for more than a week, such slurry may form a thick slurry or gel cake at the bottom of the rising edge of the liquid transfer pipe or at the valve seat, preventing subsequent liquid transfer. It has been found that this may be possible.

[Means for Solving the Problems] As a result of intensive research in order to solve the above-mentioned problems, the present inventors have found that 40% by weight or more of zeolite having a particle size of 2 to 1 Opm, which is obtained by a conventional manufacturing method, is The present invention was achieved by discovering a zeolite slurry composition containing a high concentration of zeolite, which is stable even after storage for a long time of at least two weeks, and has excellent fluidity that allows the liquid to be transferred without any trouble. That is, the present invention contains carboxymethyl ether salt of starch meal in an amount of 0.05 to 5% by weight on a dry basis with respect to zeolite having a particle size of 2 to 1 Opm, and the zeolite concentration is 40% by weight.
The present invention provides an aqueous zeolite slurry composition with excellent FJ turbidity stability and fluidity of up to 55% by weight.

The zeolite used in the present invention has a specific gravity of 2.3 to 2.
4A or 3A type zeolite with a particle size of 2 to 10 lm is preferred;
Although it is possible to form a stable slurry using zeolite exceeding 0 #Lm, it is preferable to use a bilge for detergents with a particle size of 1 Opm or less, which is a problem in the zeolite manufacturing process. By carrying out strict quality control, it is possible to exclude zeolites having a particle size of 10 ml or more.

The amount of zeolite in the aqueous zeolite slurry according to the present invention is uneconomical if it is less than 40% by weight.

When it exceeds 55%, the viscosity of the slurry increases rapidly, making it difficult to handle, especially to feed.

In the present invention, the carboxymethyl ether salt of starch meal used is obtained by etherifying starch meal, such as sweet potato or potato, with an etherification agent such as monochloroacetic acid or sodium monochlorobutyrate in the presence of an alkali.

If the amount of carboxymethyl ether salt of starch meal in the aqueous zeolite slurry according to the present invention is less than 0.05% by weight, the life as a stable slurry will be shortened, and if it exceeds 5%, the viscosity of the slurry will sharply increase. Handling, especially liquid delivery, becomes difficult. It is also uneconomical.

In carrying out the present invention, there is no problem in using the carboxymethyl ether salt of starch meal together with a thickener such as a dispersant or a water-soluble polymer.

EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

Example The water content of the zeolite (average particle size: 4 μm) used in this example was 20% by weight.

In addition, the carboxymethyl ether salt of starch lees produced by the following method was used.

Invention A - Axis 5! Add 500 g of dried sweet potato meal (hyperactive content 81%) and a solution of 210 g of sodium hydroxide in 1000 g of 50% methanol to a L blender, and mix for 30 minutes.
The mixture was stirred and mixed at ℃ for 60 minutes.

Next, a solution of 224 g of monochloroacetic acid dissolved in 224 g of 90% methanol was added dropwise to this over 60 minutes, and after further mixing at 40°C for 10 minutes, the temperature was raised to 65°C and an etherification reaction was carried out at the same temperature for 2 hours. Ta.

After the etherification was completed, one reaction solution was cooled and neutralized with acetic acid. ,
Add 2500g of 70% methanol to this neutralized solution and
After stirring for a minute, the mixture was centrifuged and subjected to solid-liquid separation, and the solid portion was dried and pulverized.

The properties of the obtained product were as follows: dry area i: 8.42%, 2% aqueous solution viscosity (using a B-type viscometer): 353 cP, and pH: 7.8.

Invention B - Axis 5! 1 Add a solution of 150 g of sodium hydroxide dissolved in 500 g of dried sweet potato meal (82% polysaccharide) and 400 g of 40% methanol to a blender.
The mixture was stirred and mixed at 0 for 60 minutes.

Next, a solution of 165 g of monochloric acid M dissolved in 165 g of 90% methanol was added dropwise to this over 60 minutes, and after further mixing at 40°C for 10 minutes, the temperature was raised to 72°C and an etherification reaction was carried out at the same temperature for 2 hours. Ta.

After the etherification was completed, the reaction solution was cooled and neutralized with acetic acid. ,
Add 3000g of 70% methanol to this neutralized solution,
After stirring for a minute, the mixture was centrifuged and subjected to solid-liquid separation, and the solid portion was dried and pulverized.

The properties of the obtained product were a loss on drying of 7.39% and a 2% aqueous solution viscosity (using a B-type viscometer) of 600 cP.

The pH was 7.5.

In this example, each aqueous zeolite slurry was obtained by the following method using the formulation shown in Table ft51.

A zeolite slurry was prepared by adding 100 parts by weight of zeolite to 100 parts by weight of water, stirring and dispersing using a domestic juice mixer, and then adding a dispersant and dissolving with stirring.

The viscosity and stability of this zeolite slurry were evaluated by the following method.

(2) Viscosity 500 ml of the slurry to be tested was transferred to a 500 ml tall beaker and measured at 25°C using a Brookfield RVTD viscometer (Tokyo Needle W).

■ Evaluation of 9% stability of zeolite slurry After measuring the viscosity, let the slurry under test stand still for 30 days, observe the state of the slurry in the tall beaker, ■ check whether a supernatant portion has formed in the slurry, ■ The presence or absence of sediment at the bottom of the slurry was evaluated as follows.

O mark: There is no supernatant liquid in the slurry, and no sediment is formed at the bottom of the slurry. O mark: A slight supernatant liquid part is formed in the slurry, but at the bottom of the slurry. If no sediment has formed, mark Δ... A supernatant liquid portion has formed in the slurry, and if sediment has formed at the bottom of the slurry, but the fluidity has been maintained, mark x... Supernatant liquid portion has formed in the slurry. If this occurs and solid sediment is formed at the bottom of the slurry ■Evaluation of slurry fluidity Regarding the fluidity of the slurry, the slurry in each beaker was heated to 170 to 1759 The slurry was flowed out in an inclined state, and the viscosity of the slurry at the time of flow out was determined, and the presence or absence of solidified matter in the slurry at the time of flow was determined, and the fluidity was evaluated as follows.

Mark 0: When the suspension is stable and has good fluidity, the entire amount flows out from the beaker.

O mark: When some sediment flows out of the beaker and the fluidity of the sediment is poor, Δ mark: When there is sediment and there are areas with no fluidity, × mark: -Top When only clear liquid flowed out and no sediment flowed, or when sediment (solidified material) was present in the beaker after the slurry was taken out, the solidified material was observed and evaluated as follows.

@ mark 1111 - When a solidified substance is stirred with a spatula, fluidity is observed and it flows out when the beaker is tilted, 0 mark... When a solidified substance is stirred with a spatula, fluidity is observed and the beaker is tilted. If the slurry does not flow out, if the solidified material is so hard that it is impossible to stir it with a spatula, if the solidified material is so hard that it is impossible to stir it with a spatula. The products were tested for each property, and the results are shown in Table 1. As is clear from Table 1,
It was confirmed that the zeolite slurry composition obtained according to the present invention had significantly better sedimentation stability than a comparative amount.

[Effects of the Invention] The aqueous zeolite slurry composition of the present invention contains 40 zeolites having a particle size of 2 to 10 μm obtained by a conventional manufacturing method.
Contains at a high concentration of ~55 wt% and for a long period of time at least 2
It is possible to provide a zeolite slurry composition that is stable even after storage for i1J and has excellent j'47F+ stability and fluidity and can be transferred without any trouble.

Claims (1)

[Claims] Contains carboxymethyl ether salt of starch meal in an amount of 0.05 to 5% by weight on a dry basis with respect to zeolite having a particle size of 2 to 10 μm, and the zeolite concentration is 40 to 55%.
Aqueous zeolite slurry composition with excellent suspension stability and fluidity in weight percent.