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Rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products

A technology of sodium hydroxide and liquid products, which is applied in the direction of chemical analysis by titration method, can solve the problems of difficulty in accurate detection of sodium cyanide production control products, quality and safety accidents, hysteresis of hydrochloric acid reaction, etc., and achieve great reference and promotion value, prevention of safety and quality accidents, and ease of operation

Inactive Publication Date: 2011-12-07
安庆新曙光精细化工有限公司
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Problems solved by technology

[0007] It can be seen from the reaction that the free ammonia in the sodium cyanide to be detected not only consumes part of the hydrochloric acid, but also ammonia is a weak base, and the reaction with hydrochloric acid lags behind, the mutation is not obvious during the titration, and the tailing is serious
This method hydrochloric acid titration actual value is greater than theoretical value, and the alkali content that records is higher than actual value, can not truly reflect the actual content of sodium hydroxide in liquid sodium cyanide, needs to measure ammonia content separately, causes analysis steps loaded down with trivial details, detection time is too long, It brings great difficulty to sodium cyanide production control and accurate product detection, and even induces the self-polymerization of hydrocyanic acid in production, resulting in quality and safety accidents

Method used

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  • Rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products
  • Rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products
  • Rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products

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Embodiment Construction

[0027] 1. Test samples

[0028] Randomly select 3 liquid sodium cyanide reaction solutions and 3 liquid sodium cyanide products as test samples, and detect the sodium cyanide content in each sample according to the GB19306-2003 regulations, so as to distinguish them.

[0029] Table 1: Test sample table

[0030]

[0031] 2. Detection process

[0032] (1) Use the national standard acid-base method and national standard silver method to detect the content of sodium hydroxide and ammonia in each sample

[0033] ① Preparation of sample solution (GB 19306-2003)

[0034] Weigh 8 g of sample 1 (about 7.5 ml), accurate to 0.0002 g. Put it in a beaker, dissolve it with water, transfer it all into a 500ml volumetric flask, add water to the mark, and shake well to obtain a sample solution.

[0035] ② Analysis of sodium cyanide content (GB 19306-2003):

[0036] Use a pipette to pipette 25ml of the sample solution, place it in a conical flask, add 75ml of water and 6-8 drops of dime...

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Abstract

The invention discloses a rapid analysis method for sodium hydroxide and ammonia content in sodium cyanide reaction solution and its liquid products, which uses excess formaldehyde and ammonia to react to generate hexamethylenetetramine, and then divides into two groups of titration with hydrochloric acid, Obtain two sets of values ​​of ammonia-containing acid consumption and ammonia-removing acid consumption, and then calculate the content of sodium hydroxide and ammonia in the sample through data measurement, thereby effectively reducing the interference of free ammonia on the analysis of sodium hydroxide content, and quickly and accurately analyzing cyanide. Sodium hydroxide content and ammonia content in sodium chloride reaction liquid and its liquid products. The method of the invention is fast and effective, has obvious mutations in analysis and titration, accurate and reliable measured values, simple and convenient operation and easy mastery.

Description

(1) Technical field [0001] The invention relates to a production of liquid sodium cyanide and a product analysis and detection method, in particular to a rapid analysis method for sodium hydroxide and ammonia content in a sodium cyanide reaction liquid and its liquid product. (two), background technology [0002] In the process of producing sodium cyanide by light oil cracking method, Angle method, and acrylonitrile by-product method, due to insufficient cracking of some raw materials ammonia cracking is mixed in the cracking gas of sodium cyanide, and the main components of the gas in the reactor after dust removal and cooling are HCN is neutralized with sodium hydroxide to generate liquid sodium cyanide, and other insoluble gases that do not participate in the reaction are discharged with the tail gas, while ammonia is dissolved in liquid sodium cyanide. At the same time, under certain conditions, part of the sodium cyanide in the liquid sodium cyanide reaction liquid and ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
Inventor 余宏霞余春林江兴中马美霞陈双莲代敏汪三六程北飞
Owner 安庆新曙光精细化工有限公司
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