KR960005426B1 - Method of preparation of carboxymethylcellulose with steam-explosion wood - Google Patents

Abstract

Wood chips are finely crushed under 25-30 kg/cm2 press. and at 220-250 deg.C for 3-9 minutes. Dis-lignification of fine crushed wood chips is achilved by mixing the chips in 1-2 % sodium chlorite sol. agitating for 2 hours at ambient temp. Next Carboxymethyl cellulose(CMC) manufacturing process follows a known method : mixing in iso-propyl alcohol, adding and NaOH mono chloro acetic anhydride cooling, filtering, mixing with MeOH, neutralizing, purifying and drying. Compared with the conventional method, the method simplifies CMC process economically by skipping the pulping of wood.

Description

Method for preparing Carboxymethyl Cellulose (CMC) from fired wood

The present invention relates to a CMC manufacturing method for producing a CMC (Carboxymethyl Cellulose) after crushing the wood and the lignin treatment of the crushed wood as it is.

CMC is a substance that gives viscosity and is harmless to the human body, so it is widely used in food additives, cosmetics, synthetic detergents, printing, papermaking and excavating additives.

However, conventionally, since the CMC is manufactured using cotton or wood pulp, the material cost is high and the process is complicated.

It takes a lot of processes to make cotton into cotton and pulp also requires a lot of processes to pulverize wood, so manufacturing cotton or pulp back into CMC through such a process is too costly as a whole. However, both cotton and pulp wood are natural resources rather than waste resources, so they are expensive to purchase. Therefore, manufacturing them with CMC was a very uneconomic problem.

According to the present invention, the CMC is produced by pulverizing the wood without pulping and then pulverizing it as it is or by delignining, so that the whole process is much shorter and simpler than the conventional manufacturing method. CMC can be manufactured using the waste wood from the plant, which is very inexpensive, and has the effect of recycling many waste resources.

In other words, the present invention is mainly to put the wood chips cut into a certain size of the waste wood in a crusher and to crush the crushed wood as it is or ligignized and the ligignized wood by CMC in a known method.

Hereinafter, the present invention will be described in detail with reference to Examples.

[Step 1]

The wood chips cut to a certain size are put into a crusher and crushed.

[Step 2]

10 gm of the crushed wood is placed in a container with 500 ml of 1-2% sodium chlorite solution, stirred at room temperature for about 2 hours, deligignized, filtered through a glass filter, thoroughly washed with water, and dried to complete the delignin process.

[Step 3]

10 g of the wood crushed in the first process or the deignified wood in the second process is placed in 250 ml of 80% isopropylaloohol, stirred sufficiently, and then 50 ml of 30% aqueous NaOH solution is added over 30 minutes at room temperature, and again. After stirring for 60 minutes, 5.5 g of monochloroacetioacid was added over 30 minutes, and the reaction was allowed to stand for 3 hours in a 55 ° C bath. After cooling, the reaction was filtered by suction with a glass filter and then stirred in 200 ml of 80% methanol. After dispersing, neutralize by adding 90% acetic acid to remove excess alkali, and then the reaction was washed three times with 200 ml of 80% methanol, washed with 200 ml of anhydrous methanol, and the product was dried in a 60 ° C. oven. Thus, the present invention is completed.

Temperature and pressure conditions at the time of explosion vary depending on the type of wood, but are shown in Table (1) below.

TABLE 1

As described above, the present invention manufactures CMC by a well-known method by treating waste wood with a known method, so that the manufacturing process is simpler and the material cost is lower than that of conventional manufacturing method of cotton or pulp that can be obtained through a considerable process. It can be used to effect.

Claims (2)

Oh the wood or wood waste into the groups pokswae the wood chips by cutting into a predetermined size pokswae pressure 25kg~30kg / cm ^2, temperature of 220~250 pokswae ℃, pokswae time 3-9 minutes the wood chips and pokswae pokswae under the conditions of acid Stirring with sodium solution and then deignignized and deignignized wood chips into isopropyl alcohol as in the conventional CMC preparation method, stirred well, and stirred again with the addition of aqueous NaOH solution, followed by addition of monochloroacetic acid. The mixture was left to cool for a while, and the cooled reactant was filtered through a filter, stirred and redispersed in methanol, neutralized by addition of acetic acid, and the reaction was repeatedly washed three times with methanol, and the resulting product was dried in a drying oven. Method for producing carboxymethyl cellulose (CMC) from the fired wood to be prepared by. The method of claim 1, wherein the crushed wood chips are placed in a container with 1-2% sodium chlorite solution and stirred for about 2 hours at room temperature to deligignize carboxymethylcellulose (CMC). ) Method of making).