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Preparation method of electric light source gas containing dibromomethane

A technology of dibromomethane and preparation method, which is applied in the directions of container discharge method, container filling method, chemical instrument and method, etc., can solve the problem that dibromomethane is easy to adhere to the wall of the container, the gas concentration of the electric light source is not up to standard, the concentration is unstable, etc. problem, to achieve the effect of high accuracy, easy to master and simple operation

Active Publication Date: 2016-06-08
BAODING BEIFANG SPECIAL GAS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of electric light source gas containing methylene bromide, which can solve the problem that methylene bromide is easily adhered to the wall of the device and the concentration of electric light source gas is not up to standard, the pass rate is low, and the concentration is not high. Stable problem, significantly improve the pass rate of electric light source gas products containing dibromomethane and the uniformity and stability of product concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare the target product electric light gas CH 2 Br 2 +Kr product, product CH 2 Br 2 Concentration C i is 1000ppm, the product pressure P is 1.5MPa, and the cylinder volume V is 40L.

[0031] Need to take CH 2 Br 2 Liquid sample volume calculation,

[0032] V 1 =P×V×C i ×R=1.5×40×1000×3.33×10 -5 =1.998ml≈2ml.

[0033] The preparation process is as follows.

[0034] 1. Evacuate the steel cylinder to below 10 Pa, close the valve of the steel cylinder, weigh the steel cylinder, record it as M 2空 .

[0035] 2. Connect the steel cylinder to the gas distribution system, and evacuate the pipeline (including the vaporizer) to below 10 Pa.

[0036] 3. Take a 2ml syringe, wash it with absolute ethanol, and purge it with high-purity nitrogen.

[0037] 4. Measure 2ml of dibromomethane liquid sample with a needle syringe, weigh it, and record it as M 1满 .

[0038] 5. Close the valve of the vaporizer, inject the liquid sample in the syringe into the closed vaporizer...

Embodiment 2-6

[0058] According to the operation steps of Example 1, the target electric light gas product of the following specifications was prepared.

[0059]

components

CH 2 Br 2 Concentration C i

pressure

Example 2

Dibromomethane + Xenon

200ppm

3MPa

Example 3

Dibromomethane + krypton

200ppm

3MPa

Example 4

Dibromomethane + krypton

400ppm

1.5MPa

Example 5

Dibromomethane + krypton

500ppm

1.5MPa

Example 6

Dibromomethane + krypton

1000ppm

1.5MPa

[0060] After calculation, CH in the final product 2 Br 2 Actual concentration C re See table below.

[0061]

CH 2 Br 2 Concentration C re

Product Standards

Example 2

204ppm

200±10ppm

Example 3

198ppm

200±10ppm

Example 4

407ppm

400±20ppm

Example 5

501ppm

500±20ppm

Example 6

1008ppm

1000±30ppm

[0062] As can be ...

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PUM

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Abstract

The invention relates to a preparation method of a special gas, in particular to a preparation method of an electric light source gas containing dibromomethane. A gravimetric method is adopted for preparation, a dibromomethane liquid sample is weighed quantitatively at room temperature, the temperature is increased to 70-80 DEG C and kept constant for 8-12 min, after the liquid sample is completely evaporated, balance gas is used for performing voltage transformation purging on the dibromomethane gas to a product steel cylinder, finally the steel cylinder is filled with the balance gas to the product pressure being P, mixing is performed, the actual concentration of the product is obtained through calculation, preparation is completed, and the balance gas is xenon or krypton. The method can solve the problem that the concentration of the electric light source gas does not reach the standard due to the fact that dibromomethane is easily stuck to a vessel wall, and remarkably improve the yield and product concentration uniformity of the electric light source gas containing dibromomethane.

Description

technical field [0001] The invention relates to the technical field of electric light sources. Background technique [0002] The electric light source gas is used to fill the electric light source to prolong its service life and improve its performance. For example, a halogen lamp is a tungsten lamp filled with bromine, iodine and other halogen elements or halides. Under the action of the halogen-containing electric light source gas, The working temperature and luminous efficacy of the filament are greatly improved, and the life of the lamp is correspondingly extended. [0003] Dibromomethane is an important raw material for electric light source gas. It is a liquid at room temperature, and its gas is mixed with xenon, krypton and other equilibrium gases as a common electric light source gas. The prior art adopts the gravimetric method to prepare the electric light source gas containing methylene bromide. After the methylene bromide is sampled and weighed, it is filled into...

Claims

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Application Information

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IPC IPC(8): B01F15/04B01F11/00B01F9/00F17C5/06F17C13/00
CPCF17C5/06F17C13/00F17C2227/0302F17C2265/025F17C2223/0123F17C2221/031B01F29/321B01F31/20B01F31/24B01F35/81B01F35/881
Inventor 刘景发王颖
Owner BAODING BEIFANG SPECIAL GAS CO LTD
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