Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring free acid in methyl chloroacetate

A technology for the determination of methyl chloroacetate and its method, which is applied in the field of determination of free acid in methyl chloroacetate, can solve the problems of low acid value results and difficulty in grasping, achieve rapid discoloration, avoid inaccurate measurement values, and facilitate titration Effect

Active Publication Date: 2014-07-30
常州克罗蒂娜化工技术有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid-base titration method can fully meet the requirements of this analysis, but due to the presence of a large number of esters, when the end point is reached, the excess sodium hydroxide is very easy to cause hydrolysis of the esters and the result is high, according to some data It is advocated that rapid titration means that the end point is counted, which is very difficult for inexperienced personnel to master. In addition, in the process of alkali solution titration, partial hydrolysis reaction will inevitably occur before the end point is reached, resulting in high results.
Another method introduces the use of benzene extraction to remove the ester first, and then carry out acid titration on the washing solution. Our experiments have proved that benzene not only has solubility for esters, but also has good solubility for chloroacetic acid. Therefore, the results of acid value determination by this method low

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 more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments,

[0009] The separating funnel is a 125ml conical separating funnel, and the acid-base titration container is a 250ml Erlenmeyer flask. Add 50ml of distilled water to the 125ml conical separating funnel, and weigh the measured sample M=3~5g (by The amount of the sample to be tested depends on the level of acidity, the amount weighed is accurate to 0.0001g), put it into a 125ml conical separatory funnel, add 20ml xylene, plug the stopper and shake for about 2 minutes, and keep opening the piston upwards Exhaust, then place it vertically, and let it stand for about 5 minutes. Put the mixed liquid in the middle and lower layers of the 125ml conical separating funnel into a 250ml Erlenmeyer flask, add 10 drops of bromocresol green-methyl red mixed indicator, and use 0.1mol / L Sodium hydroxide standard...

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

No PUM Login to View More

Abstract

The invention discloses a method for measuring free acid in methyl chloroacetate, which comprises the following steps: weighing M grams of a measured sample, and adding the measured sample into a separating funnel; adding distilled water and dimethylbenzene into the separating funnel, shaking uniformly, standing to stratify, and putting the substratum liquid in the separating funnel into an acid-base titration container; carrying out acid-base neutralizing titration in the acid-base titration container to the titration end point, and recording the consumption volume Vml of the base titration solution used in the acid-base neutralizing titration; and computing the percentage W of free acid in the measured sample according to a computing formula W%=(V*C*0.0945*100) / M, wherein C is the mol concentration of the base titration solution used in the acid-base neutralizing titration, of which the unit is mol / L. The method disclosed by the invention is quick and simple, and can accurately measure the free acid content.

Description

technical field [0001] The invention relates to a method for determining free acid in methyl chloroacetate, belonging to the technical field of determination. Background technique [0002] At present, the market supply and demand of methyl chloroacetate products are good. With the continuous improvement of product quality requirements of users in various places, acidity, an item that was originally only measured by pH test paper, must be measured by a more correct method. The acid-base titration method can fully meet the requirements of this analysis, but due to the presence of a large number of esters, when the end point is reached, the excess sodium hydroxide is very easy to cause hydrolysis of the esters and the result is high, according to some data It is advocated that rapid titration means that once the end point is reached, it is very difficult for inexperienced personnel to master it, and in the process of alkali solution titration, partial hydrolysis reaction will ...

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 徐德荣
Owner 常州克罗蒂娜化工技术有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products