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Method and device capable of continuously preparing nitrous acid ester

A technology of nitrite and nitrite, applied in the chemical industry, can solve problems such as large inorganic salts, waste water, and tail gas pollution safety hazards, and achieve the effect of small equipment investment, low energy consumption, and elimination of safety hazards

Active Publication Date: 2016-01-13
SHANDONG LANGHENG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present application provides a method and device for continuously preparing nitrite, which solves the problems of a large amount of inorganic salt waste water, tail gas pollution and major safety hazards in the prior art during the preparation of nitrite

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  • Method and device capable of continuously preparing nitrous acid ester
  • Method and device capable of continuously preparing nitrous acid ester

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Embodiment 1

[0036] This embodiment provides a kind of device for continuously preparing nitrite, as figure 2 As shown, the bipolar membrane electrodialyzer 1 is included, the inlet of the bipolar membrane electrodialyzer 1 is connected with the water tank 2 and the inorganic salt solution storage tank 3 respectively, and the outlet of the bipolar membrane electrodialyzer 1 is respectively connected with the residual inorganic salt The solution collection tank 4, the alkali solution concentration section 5 and the inorganic acid solution temporary storage tank 6 are connected;

[0037] The residual inorganic salt solution collection tank 4 is connected with the inorganic salt solution storage tank 3 through the inorganic salt solution batching kettle 15;

[0038] The inorganic acid solution temporary storage tank 6 is connected with the esterification reactor 7, and the esterification reactor 7 is also connected with an alcohol high tank 8 and a nitrite solution high tank 9;

[0039] The...

Embodiment 2

[0045] The present embodiment provides a kind of method for continuously preparing methyl nitrite, the method adopts the device among the embodiment 1, combines figure 1 with figure 2, wherein the bipolar membrane electrodialyzer is composed of multiple modules, all the chambers formed by the positive membrane and the negative surface of the bipolar membrane and all the chambers formed by the negative membrane and the positive surface of the bipolar membrane are connected in parallel and have an inlet a; The chambers composed of the membrane and the positive membrane are connected in parallel and have an inlet b; all the chambers composed of the positive membrane and the negative side of the bipolar membrane are connected in parallel and have an outlet a; all the chambers composed of the negative membrane and the positive surface of the bipolar membrane are connected in parallel and have an outlet b; All the chambers composed of the anion and yang membranes are connected in p...

Embodiment 3

[0052] Present embodiment provides a kind of method for continuously preparing ethyl nitrite, as figure 1 As shown, the method specifically includes the following steps:

[0053] Step 1, water and 20% sodium sulfate aqueous solution are pumped into the electrodialyzer from inlet a and inlet b of the bipolar membrane electrodialyzer respectively, and a DC power supply with a voltage of 1.0V is applied to the bipolar membrane electrodialyzer by a DC power supply;

[0054] Step 2, the sodium sulfate solution passes through the intermediate chamber composed of the anion and yang membranes. Under the action of a direct current electric field, the sodium ions pass through the anode membrane to the adjacent chamber formed by the anode membrane and the negative side of the bipolar membrane, and are separated from the middle chamber of the bipolar membrane. water split (OH — ) ions generate NaOH together, while the anion SO 4 — Go through the negative membrane to the adjacent chambe...

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Abstract

The invention provides a method and device capable of continuously preparing nitrous acid ester. The method comprises the following steps: taking a nitrite solution and an alcohol solution as the main raw materials, taking an inorganic salt solution as the auxiliary raw material, individually introducing the inorganic salt solution and water into a bipolar membrane electrodialysis device to carry out ionization to obtain an inorganic acid solution and an alkali solution; concentrating and recovering the alkali solution; introducing the inorganic acid solution into an esterification reactor to carry out esterification reactions with the nitrite solution and alcohol solution to obtain a reaction mixed liquid containing nitrous acid ester, making the reaction mixed liquid containing nitrous acid ester go through a gas-liquid separator or a liquid-liquid separator to obtain nitrous acid ester and mother liquor, collecting the target product namely nitrous acid ester, recovering the alcohol as raw materials for cycle use, recovering alcohol from the mother liquor, and then recovering the inorganic salt solution for cycle use. The provided method does not generate waste gas and waste liquid, the produced alkali liquid can be recovered for industrial production, the generated other byproducts can be completely recovered and reutilized in the reaction system, the production technology is environment-friendly, the reaction temperature is low, the reaction process is safe, and no safety hazard exists.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to nitrite, in particular to a method and device for continuously preparing nitrite. Background technique [0002] Nitrite is an important raw material for the synthesis of sodium azide, oxalate, ethylene glycol, high-purity nitrite and other products. The commonly used production method is to react sodium nitrite with sulfuric acid to generate nitrous acid, and then regenerate it in the reaction system. Reaction with alcohol to generate nitrite, this method will produce a large amount of by-product sodium sulfate wastewater, which is very difficult to treat with conventional methods, and the energy consumption is high and the pollution is large. The prior art discloses a method for synthesizing nitrite by ammonium oxidation for the manufacture of products such as diethyl oxalate and sodium azide. This method has low energy consumption and no high-salt wastewater, but the investment in...

Claims

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Application Information

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IPC IPC(8): C07C203/00C07C201/04
Inventor 刘湛刘林学郝光顺张明英李建民
Owner SHANDONG LANGHENG CHEM CO LTD
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