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A method for continuous refining of akd mixture

A mixture and mixer technology, applied in the direction of organic chemistry, can solve problems such as low production efficiency, high energy consumption, and lack of fundamental improvement in product quality, and achieve the goal of improving production efficiency, improving product purity, and widening product applications. Effect

Inactive Publication Date: 2016-10-05
甘肃银光聚银化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Using intermittent extraction and washing technology, the production efficiency is low, and the product quality cannot be fundamentally improved
Compared with the batch process, the continuous extraction and inclined plate separation technology has greatly improved the production capacity, but the inclined plate separation has no obvious effect on the extraction and separation of emulsions
Moreover, it is difficult to achieve continuous production by decompression or vacuum dehydration process, and the energy consumption is high.

Method used

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  • A method for continuous refining of akd mixture
  • A method for continuous refining of akd mixture
  • A method for continuous refining of akd mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Firstly, the washing system was tested using a twin-screw extruder and two sets of fiber coalescence and separation systems. The twin-screw extruder is used to remove the organic volatile components in the AKD mixture. The first set of fiber coalescence and separation system uses acidic water from the subsequent washing system, and the second set of fiber coalescence and separation system uses fresh dilute hydrochloric acid. It can play a role in guaranteeing the improvement of product quality.

[0035] In order to test the separation effect of the separator, a fiber collector is introduced in the front section of the separator, and the emulsified AKD mixture can be separated. The first oil-water mixture from the extracted stream flows into the fiber coalescer and exits on the same side into the mixer and separator. In the separator, the oil phase and the water phase can flow by themselves by adjusting the size of the U-shaped bend. When water phase entrainment in the...

Embodiment 2

[0040] The AKD-containing reaction mixture can be prepared using a condensation reaction method. Combination of paddle dryer and two sets of fiber coalescence and separation systems, such as figure 1 The method shown to refine the AKD mixture. Based on the feed meter composition assumed in Example 1, the calculations were performed using mass balance.

[0041] exist figure 1 Among them, the streams are numbered, implemented according to the specific steps in the summary of the invention, and the results are summarized in Table 1 below, where TEA=triethylamine, TEA·HCl=triethylamine hydrochloride. The refined AKD effluent has no organic solvent content and a moisture content of 300ppm.

[0042]

Embodiment 3

[0044] In order to investigate the effect, according to the content in Example 2, in order to better show the good effect of this system, we adjust the liquid level difference of the separator, make the oil-water two-phase transition disorder, change the water content entering the hot air drying system, and take samples Analyze the drying effect of this system. The following table 2 is the analysis result of sampling:

[0045]

[0046] The test analysis results in the above table show that for AKD with different compositions containing moisture and other impurities, as long as the hot air temperature is kept at 120°C and the hot air flow rate is 600Nm3, the product quality requirements can be met.

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Abstract

The invention relates to a method of continuously refining an AKD mixture. The method comprises the following steps: a, continuously removing an organic matter of a reaction mixture obtained in condensation reaction of AKD by using a dryer; b, continuously extracting, washing and separating the AKD mixture by using a multi-stage series or multi-stage parallel mode; and c, purifying the AKD mixture by adopting a hot air drying technology to obtain a qualified AKD product. According to the method disclosed by the invention, the continuous and efficient refining technology of the AKD mixture is realized, the production efficiency is greatly improved, and the quality of product is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of chemical purification treatment, in particular to a method for continuous purification and purification of AKD mixture synthesized by a condensation reaction method. Background technique [0002] AKD is the abbreviation of Alkyl Ketene Dimer (Alkyl Ketene Dimmer). It is a neutral sizing agent for papermaking pulp, mainly used in the production of high-grade paper products such as cultural paper, packaging paper, coated paper and corrugated paper. AKD neutral sizing has many advantages such as less equipment corrosion, less sewage discharge, and less energy consumption. At present, its usage has reached more than 60% of paper-making sizing agents, and it has broad market development prospects. [0003] There are many well-known methods for preparing AKD from acid chlorides, and the optimal method is to carry out condensation reaction with an acidulant to remove hydrogen chloride to synthesize AKD. Among t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D305/12
CPCC07D305/12
Inventor 李小利沈精平韩胜兵蒙鸿飞李晓明付振波张峰刘国柱
Owner 甘肃银光聚银化工有限公司