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Process for purifying (HYDRO)halocarbon compositions

A composition and technology of halogenated hydrocarbons, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve problems such as polluted products

Inactive Publication Date: 2018-07-17
MEXICHEM AMANCO HLDG DE C V
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also possible that substances used in other parts of the manufacturing process can contaminate the product in trace amounts

Method used

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  • Process for purifying (HYDRO)halocarbon compositions
  • Process for purifying (HYDRO)halocarbon compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A small sample (about 50 mg) of each sorbent was accurately weighed into a 100 μl alumina crucible. The sorbent was first preconditioned by heating from 30°C to 350°C at 20°C / min under flowing nitrogen (125ml / min). The samples were then cooled to 40°C and exposed to 16.67% v / v HFC-152a in nitrogen for 2 hours, any uptake was monitored gravimetrically. Any adsorbent showing negligible HFC-152a adsorption capacity was then further screened for methyl chloride adsorption in the same manner.

[0086] The results are shown in Table 1 below.

[0087] HFC-152a is technical grade and is from Du Pont. The material was analyzed and found to have the following composition:

[0088] Chloromethane = 28ppm

[0089] Unknown 1 = 5ppm

[0090] 254fb (CF 3CH 2 CH 2 F) = 7ppm

[0091] E-1131 (CHF=CHCl)=1.2ppm

[0092] The remaining HFC-152a (99.9588%)

Embodiment 2

[0100] A 30 g sample of HFC-152a containing 28 ppm methyl chloride was prepared. The sample was treated with 0.5 g of Union Showa carbon molecular sieve in a glass pressure roller at room temperature and autogenous pressure while stirring with a magnetic stirrer. After a contact time of 8 hours, a sample of liquid HFC-152a was removed for gas chromatographic analysis. Residual methyl chloride was measured at 9 ppm.

Embodiment 3 to 4

[0102] A small sample (about 35 mg) of each sorbent was accurately weighed into a 100 μl alumina crucible. The sorbent was first equilibrated at 30 °C under nitrogen (100 ml / min) for 5 min, then preconditioned by heating from 30 °C to 350 °C at 20 °C / min under flowing nitrogen (100 ml / min) and held at 350 °C 5 minutes. The sample was then cooled at -20°C / min to 40°C, equilibrated under nitrogen (40ml / min) for 23.8 minutes, and exposed to 16.67% v / v HFC-152a in nitrogen (60ml / min) for 2 hours.

[0103] The HFC-152a supplied in Examples 3 to 4 was found to have a methyl chloride concentration of 24 ppm. The adsorption of HFC-152a and methyl chloride by the adsorbent was measured by thermogravimetric analysis. The results are shown in Table 2.

[0104] Table 2

[0105]

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Abstract

The invention provides a composition comprising one or more desired (hydro)halocarbons and basically does not contain undesired halogenated hydrocarbon impurity. The composition is obtained through amethod of makingthe composition which contains the undesired halogenated hydrocarbon impurity contact absorbing agent that contains a carbon molecule sieve. The undesired hydrocarbon impurity containsone or more selected from mono-halide methane, bis-halide methane and tri-halide methane.

Description

[0001] This application is a divisional application of a Chinese invention patent application entitled "Method for Purifying a (Hydro) Halocarbon Composition" with an application date of April 23, 2014 and an application number of 201480029961.3. Application 201480029961.3 is a national application that entered the Chinese national phase of the international application PCT / GB2014 / 051259 filed under the Patent Cooperation Treaty. technical field [0002] The present invention relates to a method for reducing the concentration of undesired impurities, preferably undesired halogenated organic compounds, in (hydro)halocarbon compositions. Background technique [0003] (Hydro)halocarbons are commonly used as refrigerants or propellant materials. The types of (hydro)halocarbons used in these applications have changed over the past 20 years, as it has been found that some of these materials (e.g. difluorodichloromethane, R12) deplete the Earth's ozone layer, while others (e.g. Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/389C07C19/043C07C19/07C07C19/075C07C19/08C07C19/10C07C19/12C09K3/30C09K5/04A62D1/00
CPCC09K3/30C09K5/044C09K5/045C07C17/389C07C19/043C07C19/07C07C19/075C07C19/08C07C19/10C07C19/12A61K9/124A62D1/00C07C17/383C08J9/146C09K2205/122C09K2205/24
Inventor 安德鲁·沙拉特约翰·海斯克莱尔·里斯
Owner MEXICHEM AMANCO HLDG DE C V