Biurea preparation device and preparation method

A preparation device and technology of biurea, which is applied to the preparation device and field of production of biurea by condensation of hydrogen chloride gas, can solve the problems of cumbersome treatment process, many types of impurities, and high consumption of urea, so as to simplify the process and improve the conversion Efficiency, heat saving effect

Active Publication Date: 2016-12-14
QINGHAI SALT LAKE IND
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Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation device and method for biurea, which is used to solve the problem that in the existing method for producing biurea by condensation of hydrazine hydrate and urea, the acid condensation will cause many types of impurities, which are difficult to separate or reduce production capacity. The problem of low energy consumption and high energy consumption, the condensation of weak base method will cause the problems of high consumption of urea, high energy consumption, cumbersome treatment process and high cost

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  • Biurea preparation device and preparation method

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Embodiment 1

[0052] This embodiment provides a preparation method of biurea, comprising the following steps:

[0053] Step 1: Add hydrazine hydrate solution and urea into condensation kettle 2. In this step, the hydrazine hydrate solution is a 65-75g / L refined hydrazine hydrate solution, which is obtained from the crude hydrazine hydrate solution output from the reactor through pre-treatment. The specific process of the pre-treatment is to first use circulating water The temperature of the crude hydrazine hydrate solution is cooled to 25-30°C, and then the crude hydrazine hydrate solution is cooled to -3-0°C through the refrigerant, so that a large amount of sodium carbonate in the crude hydrazine hydrate is crystallized as Na 2 CO 3 10H 2 Output in the form of O, and then pass through a centrifuge to remove solid precipitates during cooling, and then obtain a 65-75g / L refined hydrazine hydrate solution. The concentration of the refined hydrazine hydrate solution added in the condensati...

Embodiment 2

[0080] This embodiment provides a preparation method of biurea, comprising the following steps:

[0081] Step 1: add 69.3g / L hydrazine hydrate solution 13m in condensation kettle 2 3 , and 2117Kg of solid urea.

[0082] Step 2: The hydrogen chloride gas generated in the hydrogen chloride synthesis furnace is sent to the condensation kettle 2 through cooling operation, chlorine adsorption operation and pressurization operation in sequence. Firstly, the cooling operation is used to lower the temperature of the hydrogen chloride gas to 100-150°C, and the cooled hydrogen chloride gas undergoes a chlorine adsorption operation to absorb free chlorine therein, so that the free chlorine content in the hydrogen chloride gas is 0.002%.

[0083] It can be seen through chemical equation calculation that in this embodiment, 2046Kg of hydrogen chloride needs to be added to the condensation kettle 2. In order to improve the conversion rate of this reaction, the flow rate of hydrogen chlorid...

Embodiment 3

[0091] This embodiment provides a preparation method of biurea, comprising the following steps:

[0092] Step 1: Add 13m of 71.6g / L hydrazine hydrate solution to condensation kettle 2 3 , and 2187Kg of solid urea.

[0093] Step 2: The hydrogen chloride gas generated in the hydrogen chloride synthesis furnace is sent to the condensation kettle 2 through cooling operation, chlorine adsorption operation and pressurization operation in sequence. First, the cooling operation is used to cool down the hydrogen chloride gas to 100-150°C, and the cooled hydrogen chloride gas undergoes chlorine adsorption operation to absorb free chlorine therein, so that the free chlorine content in the hydrogen chloride gas is 0.001%.

[0094] It can be seen from the calculation of chemical equations that in this embodiment, 2150Kg of hydrogen chloride needs to be added to the condensation kettle 2. In order to improve the conversion rate of this reaction, the flow rate of hydrogen chloride sent into...

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Abstract

The invention discloses a biurea preparation device and preparation method. The biurea preparation device comprises a hydrogen chloride treatment mechanism and a condensation kettle, wherein the hydrogen chloride treatment mechanism comprises a cooler, a chlorine adsorber, a pressure pump and a flow meter which are sequentially connected in series through a first pipe. The condensation kettle comprises a kettle body, wherein a hydrogen chloride inlet, a liquid raw material inlet and a discharging outlet are formed in the kettle body, the hydrogen chloride inlet is connected with a flow meter outlet through a second pipe, and one end of the second pipe extends into the kettle body. The biurea preparation method adopting the biurea preparation device comprises the step of treated hydrogen chloride gas participates in biurea condensation reaction to prepare a biurea finished product. The biurea preparation device is combined with the biurea preparation method, and the purposes of saving energy, improving the yield of the single condensation kettle and improving the conversion rate of hydrazine hydrate are achieved in the biurea preparation process.

Description

technical field [0001] The invention relates to the technical field of preparing biurea, in particular to a preparation device and method for producing biurea by condensation of hydrogen chloride gas. Background technique [0002] Biurea, the chemical formula is C 2 h 6 N 4 o 2 , mainly used in the production of ADC foaming agent, the demand is large. Usually hydrazine hydrate and urea are used as raw materials for condensation to produce biuret. [0003] The condensation reaction of hydrazine hydrate and urea to prepare biurea can be divided into acid condensation and weak base condensation. Acid condensation refers to the reaction of 65-75g / L hydrazine hydrate solution, urea solution and sulfuric acid or hydrochloric acid as raw materials to produce biurea, usually using 93% sulfuric acid or 30% hydrochloric acid. The equation is: [0004] N 2 h 4 ·H 2 O+2H 2 NCONH 2 +H 2 SO 4 →H 2 NCONHHNCONH 2 +(NH 4 ) 2 SO 4 +H 2 O or [0005] N 2 h 4 ·H 2 O+2H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C281/06
CPCC07C281/06Y02P20/10
Inventor 刘利德向元瑜宁鹏于雪峰俞莅军孙学敏龚小虎张元金代军礼刘林俊
Owner QINGHAI SALT LAKE IND
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