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A method for anti-explosion of dropping reaction

A dropping reaction and anti-explosion technology, applied in chemical instruments and methods, chemical/physical/physicochemical processes, chemical/physical processes, etc., can solve problems such as temperature and pressure rise, casualties, failure to reach the optimum temperature for reaction, etc. , to achieve the effect of preventing explosion and saving costs

Active Publication Date: 2016-06-08
ZHEJIANG HUAYI ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is a serious problem in this control method. Because the initial temperature of the reactor is not high, the optimum temperature for the reaction has not been reached, or the material dropped down does not fully contact with the material in the reactor. consumed by the reaction
This phenomenon often happens, and the result is that a large amount of drippings have not reacted in the reactor, and the temperature of the kettle is not high. If you continue to drop at this time, there will be more drippings in the reactor. When the reaction temperature rises and the reaction is violent, these accumulated drops will participate in the reaction at the same time, resulting in a sharp rise in temperature and pressure, causing the phenomenon of flushing, and even a direct explosion, causing casualties

Method used

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  • A method for anti-explosion of dropping reaction
  • A method for anti-explosion of dropping reaction
  • A method for anti-explosion of dropping reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Drop 30% dilute sulfuric acid into the reaction kettle filled with sodium hydroxide, the flow rate of dilute sulfuric acid is q 1 m 3 / h, the flow rate of cooling water is q 2 m 3 / h, the water temperature at the cooling water inlet is T 1 ℃, the water temperature at the outlet is T 2 ℃, the specific heat capacity of water is 4.2×10 3 J / (Kg×℃), the density of sulfuric acid is 1220Kg / m 3 .

[0042] According to the heat energy calculation formula Q=CM(T 2 -T 1 ),

[0043] The actual heat absorbed by the cooling water is

[0044] q 吸 =4.2×10 3 J / (Kg×℃)×q 2 m 3 / h×1000Kg / m 3 ×(T 2 ℃-T 1 °C)

[0045] =4.2×10 6 ×2q 2 ×(T 2 -T 1 )J / h=4.2×10 3 ×q 2 ×(T 2 -T 1 )KJ / h

[0046]

[0047] Heat of reaction:

[0048] Thermochemical reaction equation:

[0049] h 2 SO 4 +2NaOH=2H 2 O+Na 2 SO 4 △H=-114.6KJ / MOL

[0050] The heat of reaction per hour is q 放 =(q 1 m 3 / h×1220Kg / m 3 ×114.6KJ / MOL) / 98=114.6×1.22×10 6 q 1 / 98KJ / h=1.43×10 6 q 1 KJ / h, ...

Embodiment 2

[0057]Drop water into the reaction kettle filled with quicklime, the flow rate of water is q 1 m 3 / h, the flow rate of cooling water is q 2 m 3 / h, the water temperature at the cooling water inlet is T 1 ℃, the water temperature at the outlet is T 2 ℃, the specific heat capacity of water is 4.2×10 3 J / (Kg×℃), the density of water is 1000Kg / m 3 .

[0058] According to the heat energy calculation formula Q=CM(T 2 -T 1 ),

[0059] The actual heat absorption of cooling water per hour is

[0060] q 吸 =4.2×10 3 J / (Kg×℃)×q 2 m 3 / h×1000Kg / m 3 ×(T 2 ℃-T 1 °C)

[0061] =4.2×10 6 ×q 2 ×(T 2 -T 1 )J / h=4.2×10 3 ×q 2 ×(T 2 -T 1 )KJ / h

[0062]

[0063] Heat of reaction:

[0064] Thermochemical reaction equation:

[0065] h 2 O+CaO=Ca(OH) 2 △H=-163.5KJ / MOL,

[0066] The heat of reaction per hour is q 放 =(q 1 m 3 / h×1000Kg / m 3 ×163.5KJ / MOL) / 18=1000×163.5q 1 / 18KJ / h=9.08×10 6 q 1 KJ / h

[0067]

[0068] So the heat that will be released by the unrea...

Embodiment 3

[0074] Drop water into the reactor with calcium carbide, the flow rate of water is q 1 m 3 / h, the flow rate of cooling water is q 2 m 3 / h, the water temperature at the cooling water inlet is T 1 ℃, the water temperature at the outlet is T 2 ℃, the specific heat capacity of water is 4.2×10 3 J / (Kg×℃), the density of water is 1000Kg / m 3 .

[0075] According to the heat energy calculation formula Q=CM(T 2 -T 1 ),

[0076] The actual heat absorption of cooling water per hour is

[0077] q 吸 =4.2×10 3 J / (Kg×℃)×q 2 m 3 / h×1000Kg / m 3 ×(T 2 ℃-T 1 °C)

[0078] =4.2×10 6 ×q 2 ×(T 2 -T 1 )J / h=4.2×10 3 ×q 2 ×(T 2 -T 1 )KJ / h

[0079]

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Abstract

The invention provides a dripping reaction anti-explosion system and a method thereof. According to the invention, a flowmeter is added on a dripping pipe and a cooling water pipe and thermometers are added on cooling water inlet and outlet pipes; actual heat absorption of the cooling water can be worked out in a manner of integration by multiplying a temperature difference between the inlet and the outlet of the cooling water with a flow; a theoretical reaction heat discharge can be figured out by an accumulative amount of a flow in a dropping pipe and a flow flowing through the flowmeter according to actual reaction; the amount of un-reacted substances can be figured out by comparing the theoretical reaction heat discharge with the actual cooling water heat absorption; dropping is stopped if the amount of un-reacted substances is relatively large and the system is controlled to alarm. The dripping reaction anti-explosion system disclosed by the invention can prevent material-rushing phenomenon or even explosion accidents caused by steep temperature and pressure rising inside the reactor.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an anti-explosion method for dropping reaction. Background technique [0002] Dropping reaction is a reaction in which one material is added dropwise to another material, and the process is generally an exothermic reaction. Such as the Grignard reaction, the heat is very violent during the dropwise reaction. [0003] In the prior art, the dropwise reaction usually controls the dropwise amount by temperature, such as figure 1 As shown, the reaction kettle 1' is provided with a thermometer 6', and the dripping pipe of the drip tank 2' is provided with a regulating valve 5'. When the thermometer 6' detects that the temperature in the reaction kettle 1' is higher than the set value, The regulating valve 5' is closed; when the temperature is lower than the set value, the regulating valve 5' is closed. [0004] However, there is a serious problem in this control method. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00
Inventor 蒋焕炯
Owner ZHEJIANG HUAYI ENG DESIGN