A kind of method for preparing technical grade sodium carboxymethyl cellulose
A technology of sodium carboxymethyl cellulose and technical grade is applied in the field of preparing technical grade sodium carboxymethyl cellulose, and can solve the problems such as the inability to meet the demand of sodium carboxymethyl cellulose.
Active Publication Date: 2019-03-01
泸州北方纤维素有限公司
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Problems solved by technology
[0003] In the prior art, sodium carboxymethyl cellulose is generally prepared by one-time alkalization, but the reaction etherification efficiency is about 65%, and the apparent viscosity of the product performance index is basically 80-90mpa.s, which is at the upper limit of the index and cannot meet the requirements of existing petroleum Demand for Sodium Carboxymethyl Cellulose by Field
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Embodiment 1
[0032] (1) Preparation of mixed solution: 250 parts of alcohol with a concentration of 93% (v / v) and 115 parts of 48.34% (w / w) liquid caustic soda are mixed to obtain a mixed solution, and the temperature of the mixed solution is controlled at 40°C to 45°C ; Add 3.5 parts of hydrogen peroxide into the alkali wine mixture 5 minutes before feeding, and control the temperature at 40°C to 45°C after mixing;
[0033] (2), alkalization: control the temperature in the kneader at 40°C to 45°C, add 63 parts of cellulose wood pulp with cp=26mpa.s into the kneader within 10 to 12min, and mix the prepared mixture in step (1) at the same time The liquid is added into the kneader through the spray pipe, the time for adding the mixed liquid is 12 to 15 minutes, the alkalization reaction time (excluding the feeding time) is 100 minutes, and the alkalization reaction temperature is controlled at 40°C to 65°C;
[0034] (3), etherification: the material after the alkalization reaction is added 7...
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Abstract
The invention belongs to the field of chemical engineering, in particular relates to a method for preparing technical grade sodium carboxymethyl cellulose, and aims to solve the technical problem of providing a method for preparing technical grade sodium carboxymethyl cellulose. The method comprises the following steps: a, mixing alcohol and a sodium hydroxide solution so as to obtain a mixed liquid; b, uniformly mixing the mixed liquid and a cellulose raw material for alkalization reaction; c, adding an etherifying agent into the material obtained after alkalization reaction in the step b; d, mixing alcohol with the sodium hydroxide solution so as to obtain another mixed liquid; e, uniformly mixing the mixed liquid obtained in the step d with the material obtained after etherification reaction in the step c for alkalization reaction; f, adding an oxidant and alcohol into the material obtained after alkalization reaction in the step d for refining and viscosity reduction. By adopting the method, the technical grade sodium carboxymethyl cellulose with low velocity can be prepared, the purity can be greater than 75%, and the etherification efficiency can be greater than 70%.
Description
technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing technical grade sodium carboxymethyl cellulose. Background technique [0002] Technical-grade low-viscosity sodium carboxymethylcellulose is an earlier product type of petroleum-grade sodium carboxymethylcellulose in China. It is suitable for shallow wells and deep wells, so it is used in a large amount. Technical grade low-viscosity carboxymethyl cellulose sodium plays a role in water loss in drilling fluid, cementing fluid and fracturing fluid, so as to protect the wall, protect the drill bit, prevent mud loss and increase the drilling speed. [0003] In the prior art, sodium carboxymethyl cellulose is generally prepared by one-time alkalization, but the reaction etherification efficiency is about 65%, and the apparent viscosity of the product performance index is basically 80-90mpa.s, which is at the upper limit of the index and cannot meet t...
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IPC IPC(8): C08B11/12C08B1/08
Inventor 张大龙高汕杨康伦明浩彭一琳罗南斌王均民张海燕
Owner 泸州北方纤维素有限公司