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Improved raw cotton linters composition, method of making same and uses thereof

A technology of composition and linters, applied in the directions of fiber raw material, fiber raw material processing, papermaking, etc., can solve the problem of undisclosed slurry concentration and so on

Active Publication Date: 2007-05-23
HERCULES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, details of the preparation of CMC and the concentration of the slurry used to prepare said CMC are not disclosed
[0029] Although the above publications describe various types of production processes from raw cotton linters to cellulose ethers, none of them describe the use of high bulk density raw cotton linters for the production of cellulose ethers

Method used

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Examples

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preparation example Construction

[0066] In the preparation of ether derivatives, etherifying agents include alkyl halides (such as methyl chloride and ethyl chloride), halogenated olefins (such as vinyl halides and propylene halides), alkylene oxides (such as ethylene oxide, cyclic Propylene oxide and butylene oxide), glycidyl ethers, metal salts of α-haloalkanoic acids, vinyl sulfonates and mixtures thereof. Other etherifying agents are monochloroacetic acid and its salts, butyl glycidyl ether and glycidyl silanes (such as 3-glycidyloxypropyltrimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane) Methoxysilane).

[0067] Optionally the cellulose ether derivative product can be further processed to increase purity. Other treatments may include extraction of non-polymeric salts from cellulose ether products in which the cellulose derivative is substantially insoluble by use of a liquid medium.

[0068] The cellulose ether derivative product prepared by the method of the present invention includes carbox...

Embodiment 1 to 7

[0115] Cut raw cotton linters

[0116] Primary, secondary and primary cuts of raw cotton linters obtained from Planters Cotton Oil Mill, Producer Cooperative Oil Mill and Southern Cotton Oil Co., respectively, were cut and characterized (average fiber length and bulk density) as described above . The bulk densities of cut raw cotton linters collected through screens of various sizes are shown in Table 1.

Embodiment 8

[0125] Carboxymethylation of secondary cut raw cotton linters at 7.5 wt% cellulose slurry concentration

[0126] Cut raw cotton linters (52.7 g; "as is" weight) (bulk density 26 g / 100 ml), the mixture was stirred to form a slurry. After sealing the reactor, the cellulose slurry was cooled to 20 °C and stirred at 100-600 rpm to achieve a good uniform mixing. The contents of the reactor were made inert by 5 cycles of evacuation (water pump) and nitrogen purge, ensuring complete exclusion of oxygen from the reactor. Sodium hydroxide solution (44.97 g sodium hydroxide dissolved in 73.4 g water) was added to the well stirred raw cotton slurry at 20°C. After adding sodium hydroxide, the cellulose slurry was stirred at 20°C for 1 hour to form activated cellulose.

[0127] Then, a solution of monochloroacetic acid (MCA) (51.53 g MCA dissolved in 51.53 g isopropanol) was added to the activated cellulose slurry at 20° C. under nitrogen atmosphere. The resulting mixed reaction mixtu...

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Abstract

A composition of a loose mass of comminuted raw cotton linter fibers has a bulk density of at least 8 g / 100 ml and at least 50 % of the fibers in the mass passes through a US standard sieve size #10 (2 mm opening). This composition is made by obtaining a loose mass of first cut, second cut, third cut, or mill runs raw cotton linters or mixtures thereof and comminuting the loose mass of raw cotton linters to a size wherein at least 50 % pass through a US standard sieve size #10 (2 mm opening). This composition is used to make cellulose ether derivatives.

Description

technical field [0001] The present invention relates to a novel composition of raw cotton linters, to a process for the preparation of the composition and to its use. More specifically, the present invention relates to raw cotton linters of high bulk density, a process for the preparation of such raw cotton linters, and the use of such raw cotton linters for the preparation of industrially usable water-soluble and water-swellable cellulose ether derivatives . Background technique [0002] Cellulose ethers represent an important class of water-soluble polymers (WSP). Examples of such WSPs include carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), methylcellulose (MC) and hydroxypropylcellulose (HPC). By introducing additional functional groups into such cellulose ethers, a large number of mixed cellulose ether derivatives can be generated. Currently, cellulose ethers are prepared by reacting cellulose with a suitable etherifying agent. The cellulosic materials use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B1/00C08B11/00C08B11/04C08B11/02C08B11/193
CPCC08B11/193C08B11/00C08B1/00C08B11/04C08B11/02D10B2201/02D21B1/00
Inventor 保罗·C.·吉勒特托马斯·G.·马杰韦茨阿尔琼·C.·萨乌
Owner HERCULES INC
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