CN102424407A

CN102424407A - Continuous production device of sodium amide

Info

Publication number: CN102424407A
Application number: CN2011102657457A
Authority: CN
Inventors: 韩扶军
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-08
Filing date: 2011-09-08
Publication date: 2012-04-25

Abstract

The invention discloses a multi-stage continuous stirred tank reactor (CSTR) for producing sodium amide through countercurrent continuous reaction of metallic sodium and ammonia. The continuous production device is characterized by: the device integrates a single-vessel type ventilation reaction vessel of present sodium amide manufacture factories, 2-8 ventilation reaction vessel are in series linked, materials are processed by a gas-liquid counter current way, 200 DEG C liquid sodium is charged in from the last stage and overflows to the first stage from the last stage step by step by utilizing the liquid level, and simultaneously is heated gradually to about 350 DEG C by the reaction heat, thus a qualified product obtained from the first stage; liquid ammonia is decompressed to 1-2 kg by a throttling pressure-reducing valve from a liquid ammonia storage tank and is vaporized by a vaporizing unit and then enters in a kettle bottom ventilation coil pipe of a first stage reaction vessel, the liquid ammonia is reacted with a mixed solution of sodium amide and metallic sodium of the reaction vessel after coil pipe distribution, the reacted gas of the first stage reaction vessel contains unreacted ammonia gas and by-product hydrogen, the gases enters in a gas distribution pipe of a second stage reaction vessel as well, and so forth, and a total of stage 2-10 are designed in the device.

Description

A kind of sodium amide serialization production equipment

Technical field

The present invention relates to a kind of sodium amide production equipment, is a kind of multistage complete mixing flow serialization production equipment with sodium Metal 99.5 and ammonia gas react production sodium amide and hydrogen.

Background technology

Sodium amide chemical molecular formula NaNH2,210 ℃ of fusing points, 400 ℃ of boiling points, normal temperature are white crystalline powder down, the moisture absorption is decomposed easily.Sodium amide has purposes widely in chemical industry, field of medicaments; Mainly be used to organic synthesis, condensing agent, dewatering agent, agent, alkylating agent, ammoniation agent, initiator, also be used to make the raw material of chemical productss such as triazo-compound, fluorochemical, bipseudoindoxyl dye, hydrazine.Sodium amide is a kind of of great value inorganic product, and domestic have at least 5 tame enterprises producing sodium amide now, and YO is more than tens thousand of tons.

Sodium amide is that ammonia and Liquid Sodium are reacted generation between 200 ℃ to 400 ℃, can produce hydrogen simultaneously.The petty official learns and pass at CN1944258A and discloses a kind of method for producing sodium amide, in ammonia metathetical dry reaction still, is adding sodium Metal 99.5, under ammonia purges with electric furnace reacting by heating still; During still temperature rise to 200 ℃-220 ℃; Feed liquefied ammonia, stop heating during still temperature rise to 350 ℃ ~ 370 ℃, make through the regulator solution ammonia flow to maintain the temperature at 370 ℃ ~ 400 ℃ in the still until reaction terminating; After treating that sodium amide is cooled to 250 ℃-300 ℃ in the still, re-use the section of drum-type slicing machine get final product finished product.

CN 101591009 discloses the continuous production method of other a kind of sodium amide, with the sodium Metal 99.5 of liquid state at a certain temperature, adds continuously in the preparatory synthetic tower of ammonia sodium; Circulate through ammonia sodium recycle pump; A part is got back in the preparatory synthetic tower, and the ammonia intact with ammonia sodium synthetic tower unreacted carries out pre-reaction under 300 ℃-400 ℃, and tail gas is discharged from the top of tower; Another part then gets into ammonia sodium synthetic tower, reacts down at 300 ℃-400 ℃ with ammonia to obtain sodium amide.Reaction tower can be packing tower, tray column, bubble tower or void tower.

The device of single kettle type is simple and practical, generally uses at home, though ammonia and sodium Metal 99.5 speed of response are very fast; But because the amounts of hydrogen that reaction produces is very big, a large amount of hydrogen can be carried a large amount of ammonias secretly and get in the middle of the tail gas, and tail gas need through water washing ammonia is absorbed and then evaporation purify after reuse again; There is a large amount of ammonia recycle in whole process, and the ammonia utilising efficiency is not high, and attached energy consumption is big; The another one problem of the device of single still is exactly that production capacity is little; Large-scale degree is low, manual work, and power consumption or the like is all high.Two tower devices have solved the problem of single kettle type device to a certain extent, and the ammonia utilising efficiency is high, and energy consumption is also low, and are artificial relative also not high; Just with respect to single kettle type, device height has obvious increase, and it is very complicated that the equipment pipeline also becomes; The complexity of operation is higher than the still formula, if run into overhaul of the equipments in process of production, sodium Metal 99.5 sticks on filler and the column plate and very easily catches fire; Can't overhaul simply, also pretty troublesome in start-stop car process, temperature control is also very unstable.Though so the gas-to-liquid contact area has been strengthened in tower reaction theoretically, improved efficient, the negative factor that brings has also hindered the popularization of this technology.

Summary of the invention

Apparatus of the present invention are that to utilize a primitive reaction device in the chemical reactor be multistage CSTR reactor design.It integrates the single kettle type ventilatory response still that utilizes existing sodium amide manufacturer; 2-10 ventilatory response still connected; What material adopted is the mode that flows to of gas-liquid counter current, and the liquid sodium about 200 ℃ is reinforced from final stage, utilizes liquid level to overflow to the first step step by step from final stage; Be heated to gradually about 350 ℃ by reaction heat simultaneously, final specification product go out system from first step overflow and obtain.Liquefied ammonia reduces pressure from liquid ammonia storage tank process expenditure and pressure valve, and the 1-2 kilogram passes through a vapourizing unit vaporization after the coil pipe of ventilating at the bottom of the still of inflow-rate of water turbine meter metering back entering first step reaction kettle; The Polycondensation Reactor and Esterification Reactor mouth reacts through sodium amide and the sodium Metal 99.5 mixing solutions that high potential difference overflows to first step reaction kettle through coil pipe distribution back with from the second stage; Contain unreacted ammonia and sub product hydrogen in the gas that the reaction of first step reaction kettle finishes; This gas gets into the gas distribution tube of the 2nd order reaction still again, analogizes by this, and one has between 2 grades to 10 grades; Basically do not had remaining ammonia in the discharge gas of final stage, this gas can directly get into vent gas treatment workshop section.

This device adopts existing installation, only changes pipeline and just can realize serialization production, has promoted the yield of ammonia simultaneously; Overhaul of the equipments is also than being easier to; Just can realize that the individual equipment volume is less as long as corresponding valve is installed in the pipeline that connects, it is also easy to overhaul.

Description of drawings

Figure one is the brief introduction figure of this device, this Figure illustrates one 4 stage arrangement, and reality can be between the 2-10 level.

Shown in figure one, 1-liquid ammonia storage tank, 2-liquefied ammonia under meter, 3-liquefied ammonia valve, 4-gas ammonia ventpipe, 5-stage reactor, 6-liquid sodium upflow tube, 7-stage reactor, 8-stage reactor, 9-stage reactor, 10-tail gas discharging pipe, 11-liquid sodium under meter, 12-liquid sodium valves door, 13-liquid sodium pump, 14-liquid sodium storage tank.

Claims

1. the device of sodium amide is produced in a serialization, is a kind of multistage complete mixing flow reactor drum, is used for sodium Metal 99.5 and ammonia successive reaction are made the device of sodium amide and hydrogen.

2. generally the 2-10 level can be arranged according to the described multistage complete mixing flow reactor drum of claim one, preferred 4-8 stage reactor.

3. adopt the mode contact reacts of gas-liquid counter current according to the described multistage complete mixing flow reactor drum of claim one, gas has gas distribution tube, and it can counter current contact between reactor grade and the level high-order official post to be arranged.