Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene

a technology of bromodifluoromethyl and purification method, which is applied in the field of purification method, can solve the problems of difficult use of silica gel column to purify 1,4-bis (bromodifluoromethyl) benzene, similar polarities of impurities,

Inactive Publication Date: 2009-03-12
NAT CHUNG SHAN INST SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach effectively separates impurities and achieves high-purity 1,4-bis(bromodifluoromethyl) benzene with a purity of above 99.6%, overcoming the limitations of conventional purification methods.

Problems solved by technology

However, these impurities have similar polarities as the main product.
Therefore, it is hard to use a silica gel column to purify the 1,4-bis (bromodifluoromethyl) benzene.

Method used

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  • Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene
  • Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene
  • Method and device for purifying 1,4-bis (bromodifluoromethyl) benzene

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Embodiment Construction

[0013]As shown in FIG. 1, the disclosed method for purifying 1,4-bis (bromodifluoromethyl) benzene include the following steps:

[0014]First, solutions resulting from addition of high boiling-point solvent to 1,4-bis (bromodifluoromethyl) benzene crude products, wherein diphenylmethane is used as the solvent in one embodiment, are mixed to obtain their mixture (step 100). The mixture is evaporated under ambient pressure or a reduced pressure, 10 torr being utilized in one embodiment, to obtain evaporated products (step 200). A gas chromatography (GC) is used to detect the purity of the evaporated products in batches (step 300). The evaporated product with purity lower than an expected value is abandoned (step 400). Finally, the evaporated product reaching the expected purity is collected (step 500).

[0015]As shown in FIG. 2, the disclosed purification device contains a flask 80, a heater 10, a column 40, a collecting cup 70, a temperature controller 20, and a temperature recorder 30. T...

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Abstract

A method and a device for purifying 1,4-bis (bromodifluoromethyl) benzene are disclosed. In order to solve the problem of hard to purify and separate 1,4-bis (bromodifluoromethyl) benzene crude products, diphenylmethane that has a higher boiling point and does not interact with 1,4-bis (bromodifluoromethyl) benzene is mixed with the 1,4-bis (bromodifluoromethyl) benzene crude products for evaporation. Afterwards, the purity of the vaporized product is detected and only that reaching an expected purity is collected to obtain high-purity 1,4-bis (bromodifluoromethyl) benzene.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a division of U.S. application Ser. No. 10 / 898,925, filed Jul. 27, 2004, which claimed Priority from Taiwanese application No. 93113187, filed May 11, 2004, the entire disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of Invention[0003]The invention relates to a purification method and, in particular, to a method for purifying 1,4-bis (bromodifluoromethyl) benzene.[0004]2. Related Art[0005]Low dielectric-constant materials have smaller dielectric constants that can reduce the interference of currents among wires to increase the transmission functions inside integrated circuits (IC). It has become a trend to apply low dielectric-constant materials to various products. The speed of many advanced products can be increased by using low dielectric-constant materials. Products with low interference wires can reduce power consumption and increase the efficiency to dominate the market.[0006]...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B01D3/02B01D3/08B01D3/10C07C17/386B01D5/00C07C17/14C07C17/38C07C19/00C07C22/08
CPCB01D3/085B01D3/10B01D5/0063B01D5/009C07C17/14C07C17/386C07C22/08
InventorJONG, SHEAN-JENGLIN, CHUN-HSUTU, CHAO-CHOUCHANG, CHUNG-CHIEN
OwnerNAT CHUNG SHAN INST SCI & TECH