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Process for preparing poly-diallyldimethyl ammonium chloride

A technology of dimethyl diallyl ammonium chloride and purification agent, which is applied in the field of preparation of polydimethyl diallyl ammonium chloride, and can solve the problems of waste of water resources, heavy environmental pollution, and heavy workload , to protect the environment, improve cleaning efficiency, save energy and water

Inactive Publication Date: 2005-01-19
阎醒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of purifying allyl chloride by rectification are large energy consumption, heavy workload, many equipments, high risk, large loss (about 10%), and great environmental pollution.
Later, some people purify allyl chloride by washing with water, which is better than distillation, but generally uses more water, and often needs to be washed more than three times to get a satisfactory result, which is a great waste of water resources.

Method used

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  • Process for preparing poly-diallyldimethyl ammonium chloride

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] Put 245Kg of industrial chloropropene in the reaction kettle, add 50Kg of water containing 50g of purifying agent, and the purifying agent is 4%Na 2 CO 3 , 4% EDTA-2Na equal volume mixed solution (molar ratio is 3.5: 1), the addition of scavenger in water is 0.1%, stirring and mixing for half an hour, after clarification and stratification, put the water layer. If the interface is dirty, wash it again according to the above method.

[0028] Mix 4% sodium fluoride solution and 4% sodium diethylenetriaminepentaacetate solution in equal amounts (9.4:1 molar ratio) to prepare a catalyst.

[0029] Add 100g of catalyst to 168.8Kg of 40% dimethylamine aqueous solution, under normal temperature, drop 150Kg of dimethylamine and 40% NaOH aqueous solution into chloropropene, in the whole dropping process, under the protection of nitrogen, keep stirring, the highest The temperature does not exceed 45°C. After the dropwise addition was completed, the temperature was raised to 50-...

Embodiment 2

[0031] Get 25Kg of DADMAC prepared above, add 5Kg of pure water and stir evenly, add initiator APS 5g (made into 20% aqueous solution), place at normal temperature, along with the carrying out of polymerization reaction, system temperature rises gradually, keep polymerization temperature to be 50 After 10 hours at °C, a viscous solution of PDADMAC was obtained. With 0.5M sodium chloride as solvent, the measured limit viscosity is 1.24, according to η ∞ =3.982×10 -4 m 0.566 Calculation, M=1.49×10 6 .

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Abstract

The invention relates to a process for preparing poly-diallyldimethyl ammonium chloride which comprises the steps of, (1) using alkali carbonate and complexing agent mixed solution as decontaminating agent for one time or multiple scouring to the allyl chloride, (2) dropping dimethylamine solution and alkali metal hydride solution into the allyl chloride solution, charging catalyst, (3) controlling the temperature between 40-70 deg. C, the reacting time being 2-4 hours, pumping water and low-boiling-point substance through decompression, obtaining DADMAC, (4) charging initiating agent into DADMAC solution, adjusting the pH value to 6, performing auto-polymerization at atmospheric temperature.

Description

technical field [0001] The present invention relates to the preparation method of polydimethyl diallyl ammonium chloride. Background technique [0002] Polydimethyldiallylammonium chloride is a very useful organic polyelectrolyte. It is the only synthetic polyelectrolyte approved by the US F.H.S (Department of Public Health) as a tap water purifier, and also approved by the US F.D.A (Food and Drug Administration) as a flocculant for the preparation of food contact paper. It can be seen that it is an environmentally friendly chemical additive. It can be used as water treatment agent, papermaking auxiliary agent, printing and dyeing auxiliary agent, hair cosmetic auxiliary agent, etc. Different application fields have different requirements for polymer molecular weight, which requires us to prepare high molecular weight polymers and have a set of molecular weight control technology to produce products with various molecular weights to meet different needs. [0003] Polydime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F4/00C08F126/02
Inventor 阎醒
Owner 阎醒
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