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Preparation method of reagent grade potassium nitrite and sodium oxalate

A technology of potassium nitrite and reagent grade, applied in the field of preparation of reagent grade potassium nitrite and sodium oxalate

Inactive Publication Date: 2015-11-04
TIANJIN GUANGFU TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems that the existing potassium nitrite preparation method has relatively large environmental pollution, complex and cumbersome process, and cannot realize the joint production of potassium nitrite and sodium oxalate. Then propose a kind of preparation method of reagent grade potassium nitrite and sodium oxalate

Method used

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specific Embodiment approach 1

[0019] Specific embodiment one: the preparation method of a kind of reagent grade potassium nitrite and sodium oxalate described in this embodiment is realized through the following steps:

[0020] Step 1. Add potassium hydroxide and oxalic acid into a 50L reactor according to the ratio of potassium hydroxide: oxalic acid = 1.5~1.6:1, add water to prepare a 20%~30% aqueous solution, filter and collect the filtrate;

[0021] Step 2. In another reaction kettle, add sodium nitrite with 1.6 times the amount of oxalic acid, add water to prepare a 40%~60% solution, keep warm and settle for 10 hours, and take out the supernatant;

[0022] Step 3. Heat the filtrate in step 1 to 85°C, add the supernatant in step 2 into the filtrate while stirring, and keep at 80°C for 30 minutes;

[0023] Step 4, the mixed solution in step 3 is filtered, and filtrate and precipitation are collected respectively;

[0024] Step 5. Wash the precipitate in step 4 twice with hot water at 90°C, and dry it a...

Embodiment 1

[0030] Step 1. Add potassium hydroxide and oxalic acid into a 50L reactor according to the ratio of potassium hydroxide: oxalic acid = 1.5:1, add water to prepare a 30% aqueous solution, filter and collect the filtrate;

[0031] Step 2. In another reaction kettle, add sodium nitrite with 1.6 times the amount of oxalic acid, add water to prepare a 40% solution, heat and settle for 10 hours, and take out the supernatant;

[0032] Step 3. Heat the filtrate in step 1 to 85°C, add the supernatant in step 2 into the filtrate while stirring, and keep at 80°C for 30 minutes;

[0033] Step 4, the mixed solution in step 3 is filtered, and filtrate and precipitation are collected respectively;

[0034] Step 5. Wash the precipitate in step 4 twice with hot water at 90°C, and dry it at 100°C to obtain reagent grade sodium oxalate;

[0035] Step 6. Concentrate the filtrate in step 4 to a specific gravity of 1.5 to 1.8 at 80°C, cool and precipitate the precipitate, dry the precipitate, and ...

Embodiment 2

[0040] Step 1. Add potassium hydroxide and oxalic acid into a 50L reactor according to the ratio of potassium hydroxide: oxalic acid = 1.6:1, add water to prepare a 20% aqueous solution, filter and collect the filtrate;

[0041] Step 2. In another reaction kettle, add sodium nitrite with 1.6 times the amount of oxalic acid, add water to prepare a 60% solution, heat and settle for 10 hours, and take out the supernatant;

[0042] Step 3. Heat the filtrate in step 1 to 85°C, add the supernatant in step 2 into the filtrate while stirring, and keep at 80°C for 30 minutes;

[0043] Step 4, the mixed solution in step 3 is filtered, and filtrate and precipitation are collected respectively;

[0044] Step 5. Wash the precipitate in step 4 twice with hot water at 90°C, and dry it at 100°C to obtain reagent grade sodium oxalate;

[0045] Step 6. Concentrate the filtrate in step 4 to a specific gravity of 1.5 to 1.8 at 80°C, cool and precipitate the precipitate, dry the precipitate, and ...

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Abstract

The invention relates to a preparation method of potassium nitrite and sodium oxalate and in particular relates to a preparation method of reagent grade potassium nitrite and sodium oxalate, aiming to solve the problems that existing potassium nitrite preparation methods cause more severe environmental pollution and are complex and tedious in processes. The preparation method comprises the following specific steps: adding potassium hydroxide and oxalic acid to a 50L reaction kettle, adding water to prepare a water solution, filtering the water solution and collecting filtrate; adding sodium nitrite and water to the other reaction kettle to prepare a water solution, insulating and precipitating the water solution and taking supernatant; filtering mixed liquor and collecting filtrate and a precipitate respectively; pulping and washing the precipitate twice with hot water and spin-drying the precipitate, thus obtaining reagent grade sodium oxalate; preparing a water solution with industrial grade potassium nitrite and hot water and then carrying out fine filtration; concentrating mother liquor obtained after fine filtration, spin-drying and washing the concentrate twice, then spin-drying the concentrate and drying the concentrate, thus obtaining reagent grade potassium nitrite. The preparation method is used in the field of chemical reagents.

Description

technical field [0001] The present invention relates to a kind of preparation method of potassium nitrite and sodium oxalate, more specifically, relate to a kind of preparation method of reagent grade potassium nitrite and sodium oxalate. Background technique [0002] Potassium nitrite is a food coloring agent and color-retaining agent allowed to be used in my country. It can produce a special flavor during the color-protecting process, so it is widely used in food, especially as a color-protecting agent and flavoring agent for meat. Potassium nitrite can also inhibit a variety of anaerobic Clostridium, especially Clostridium botulinum, so it is allowed to be used as a preservative for various canned meat and products in my country. Potassium nitrite is also a reducing agent in organic synthesis, and can also be used in the manufacture of aniline dyes and azo fuels. It is also used in the separation of nickel and cobalt in metallurgy. At the same time, it is also used to an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/50C07C55/07C07C51/41C07C51/42
Inventor 杨万龙张勇
Owner TIANJIN GUANGFU TECH DEV
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