HPMC preparation method and device
A preparation device and refined cotton technology, applied in the field of HPMC preparation, can solve problems such as waste, increased water treatment costs and burdens, and unstable flow, and achieve the goal of reducing impurities and iron content, increasing costs and burdens, and low production prices Effect
Inactive Publication Date: 2015-11-11
YANGZHOU ZHONGFU BIOTECH CO LTD
View PDF0 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] The domestic traditional HPMC production of cellulose ether adopts the slurry method, using solvents such as isopropanol and toluene as the dispersion medium, which has the following defects: 1) Acetone is flammable, volatile and easy to cause toxicity, and toluene is flammable and explosive, causing great environmental pollution; 2 ) The dimethyl ether produced in the production process is discharged together with the water, causing great waste, and will cause huge water COD content, increase the cost and burden of water treatment, and cause environmental pollution
[0007] Its existing problems: Since the reacted slurry sometimes forms lumps, it may block the inlet and outlet pipelines during the transportation process, resulting in unstable flow, pipeline blockage, etc.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] The refined cotton of the present invention is obtained after pulverization, adding alkali for alkalization, adding dimethyl ether as a dispersion medium, etherification with etherifying agent MeCl and EO / PO, and neutralizing after treatment.
[0026] The etherification process: first add MeCl and DME after vacuuming, and the two are added according to the mass ratio MeCl:DME=1:3-5;
[0027] Then when the reactor pressure increases to 6-7bar, increase the rotation speed of the reactor mixer to 40rpm, and then add MeCl and EO / PO when the pressure is stable. Due to the addition of MeCl and DME, the original vacuum degree of the system was destroyed, and the reactor pressure began to rise, and then when the reactor pressure increased to 6-7bar, the speed of the reactor mixer was increased to 40rpm, and when the pressure was stable, add MeCl, EO / PO and other etherification agents, and finally add 50% sodium hydroxide.
[0028] At the same time, because the alkalization rea...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| transmittivity | aaaaa | aaaaa |
| transmittivity | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to an HPMC preparation method and device. HPMC is obtained by smashing refined cotton, adding alkali for alkalization, then adding a dispersion medium, namely, di methyl ether (DME), adding an etherifying agent, namely, methane chloride (MeCl) or ethylene oxide (EO) or propylene oxide (PO) for etherification and then conducting neutralization. By means of the method and device, DME produced in the reaction process can be recycled, and meanwhile the reaction is stable and smooth.
Description
technical field [0001] The invention relates to a preparation method and a preparation device of HPMC. Background technique [0002] The domestic traditional HPMC production of cellulose ether adopts the slurry method, using solvents such as isopropanol and toluene as the dispersion medium, which has the following defects: 1) Acetone is flammable, volatile and easy to cause toxicity, and toluene is flammable and explosive, causing great environmental pollution; 2 ) The dimethyl ether produced in the production process is discharged together with the water, causing great waste, and it will also cause huge water COD content, increase the cost and burden of water treatment, and cause environmental pollution. [0003] Moreover, in the production process of HPMC, since the rust or metal substances of the equipment itself may enter the cellulose powder when the pulverizer crushes the cellulose, the finished powder will contain a large amount of impurities and iron content. For spe...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/08C08B17/06
Inventor 杨涛卞朋
Owner YANGZHOU ZHONGFU BIOTECH CO LTD