WO2020215746A1 - Variable-pressure desolventizing method - Google Patents
Variable-pressure desolventizing method Download PDFInfo
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- WO2020215746A1 WO2020215746A1 PCT/CN2019/124756 CN2019124756W WO2020215746A1 WO 2020215746 A1 WO2020215746 A1 WO 2020215746A1 CN 2019124756 W CN2019124756 W CN 2019124756W WO 2020215746 A1 WO2020215746 A1 WO 2020215746A1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
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- the invention relates to a variable pressure desolventizing method.
- Vacuum or atmospheric pressure evaporation desolvation is a common separation method, which is mainly used for the preliminary separation of several liquids with large boiling points.
- the advantage of vacuum desolventization is that it can reduce the vaporization temperature of the liquid, but the process is difficult to control and easy to produce bumping.
- Normal pressure desolventization requires higher heat medium temperature, and the desolventization efficiency is relatively low and energy consumption is high.
- the purpose of the present invention is to provide a variable pressure desolventization method that realizes high-efficiency separation of multi-component liquids.
- a pressure swing desolventizing method characterized in that: a pressure swing desolventizing process device is adopted; the pressure variable desolventizing process device includes a desolventizing kettle, a gas flow meter, a first condenser, a vacuum unit, and a second Condenser; the first condenser is connected to the first light component collection tank used to collect the light components flowing out of the first condenser, and the second condenser is connected to the second light component collecting tank used to collect the light components flowing out of the second condenser Component collection tank;
- the two-component or multi-component mixture collected in the desolventizing kettle is heated by a heating source to vaporize the light components.
- the vaporization temperature is related to the pressure in the desolventizing kettle, and the desolventizing kettle
- the pressure is determined by the adjustment of the vacuum pump group: the vacuum pump group adjusts the pumping volume by adjusting the motor speed of the vacuum pump group through frequency conversion, thereby adjusting the pressure in the desolventizing kettle;
- the condensing load of the condenser increases, which affects the condensing effect, and may cause materials to escape, cause losses, and increase the exhaust gas treatment load; in order to prevent the above phenomenon from happening, set the maximum Evaporation capacity: Under this evaporation capacity, bumping will not occur and the subsequent condenser condensation recovery effect will be better; as time goes by, the content of light components in the desolventizer mixture will become less and less, and the evaporation capacity will be At this time, the motor speed of the vacuum unit is automatically adjusted through the frequency conversion to increase the vacuum to maintain the evaporation rate.
- the vaporization amount The limit vacuum evaporation is maintained at this time.
- the gas flowmeter shows the minimum value or the online analyzer shows that the evaporated light component content is lower than the set index, the interlock will cut off the heating source and stop. Vacuum unit; the evaporated light components are condensed by the first condenser and the second condenser and then recycled to the first light component collection tank and the second light component collection tank.
- the gas flow meter is connected to the online analyzer.
- the vacuum unit adopts the form of frequency conversion to adjust the motor speed.
- the online analyzer is set in front of the flow meter, and a regulating valve is set between the flow meter and the first condenser; the operation process is to realize the volatilization of light components through heating, and online detection and real-time monitoring of the components are used to control the opening and closing of the heat source valve .
- the flowmeter monitors the flow in real time, and realizes the vacuum stability in the reactor by adjusting the opening degree of the valve and/or the operating frequency of the vacuum unit.
- the first condenser mainly acts as a cooling gas, which is beneficial to maintain the operation of the vacuum pump.
- the present invention can set the maximum instantaneous evaporation capacity, implement variable pressure desolvation, and overcome the constant pressure according to the correlation between the change in the concentration of related components of the mixed liquid to be separated during the desolventization process and the system vacuum and vaporization capacity.
- Desolventization is prone to bumping, high energy consumption, and relatively large material loss, which is beneficial to improve desolventization separation efficiency and recovery effect.
- the primary and secondary condensing devices used for light component recovery are installed before and after the vacuum unit, with vacuum condensation at the front and micro-positive pressure condensation at the rear to ensure that the light components can be fully recovered, reducing material loss and exhaust gas processing burden.
- the motor speed is adjusted through the frequency conversion of the vacuum unit, and the light component evaporation and the system vacuum are indirectly adjusted, which is more intuitive and easier to realize automatic control.
- the changing trend of the vacuum of the desolventizing system is: from zero to gradually increase, until the set high value is reached and maintained for a certain period of time to ensure the desolventizing and separation effect.
- the temperature and energy control target of the desolventizing heating source under the premise of ensuring the ultimate vacuum, the reconstituted component does not evaporate, and the other conditions can be coordinated with the vacuum unit to adjust the evaporation of the light component in the desolventizing kettle as close to the setting as possible The maximum evaporation capacity.
- the instantaneous maximum flow (evaporation) of the mixed liquid materials of different components to be evaporated, desolventized and separated is calculated and set according to the proportion of each component, so as not to produce bumping, and minimize the carrying and evaporation of the recombined components.
- the light components can be fully recovered as a basis.
- the process device is used for continuous feeding of the desolventizing kettle, continuous desolventizing, the process will be more stable and the efficiency will be higher.
- the target product of the process device can be light component or reconstituted component, which can be designed and set according to needs.
- the device has low investment, small footprint, can be integrated and assembled, and has a good application and promotion prospect.
- Fig. 1 is a schematic diagram of the structure of the variable pressure desolventization process device in Example 1 of the present invention.
- Example 2 is a schematic diagram of the structure of the pressure swing desolventizing process device in Example 2 of the present invention.
- a pressure swing desolventization method adopts a pressure swing desolventization process device;
- the pressure swing desolventization process device includes a desolventizing kettle 1, a gas flow meter 2, a first condenser 3, a vacuum unit 4, and a second Condenser 5;
- the first condenser is connected to the first light component collection tank 6 used to collect the light components flowing out of the first condenser, and the second condenser is connected to the first light component collecting tank 6 used to collect the light components flowing out of the second condenser
- the gas flow meter is connected to the online analyzer 8.
- the vacuum unit adopts the form of frequency conversion to adjust the motor speed.
- the two-component or multi-component mixture collected in the desolventizing kettle is heated by a heating source to vaporize the light components.
- the vaporization temperature is related to the pressure in the desolventizing kettle, and the desolventizing kettle
- the pressure is determined by the adjustment of the vacuum pump group: the vacuum pump group adjusts the pumping volume by adjusting the motor speed of the vacuum pump group through frequency conversion, thereby adjusting the pressure in the desolventizing kettle.
- the condensing load of the condenser increases, which affects the condensing effect, and may cause materials to escape, cause losses, and increase the exhaust gas treatment load; in order to prevent the above phenomenon from happening, set the maximum Evaporation capacity: Under this evaporation capacity, bumping will not occur and the subsequent condenser condensation recovery effect will be better; as time goes by, the content of light components in the desolventizer mixture will become less and less, and the evaporation capacity will be At this time, the motor speed of the vacuum unit is automatically adjusted through the frequency conversion to increase the vacuum to maintain the evaporation rate.
- the vaporization amount The limit vacuum evaporation is maintained at this time.
- the gas flowmeter shows the minimum value or the online analyzer shows that the evaporated light component content is lower than the set index, the interlock will cut off the heating source and stop. Vacuum unit; the evaporated light components are condensed by the first condenser and the second condenser and then recycled to the first light component collection tank and the second light component collection tank.
- the online analyzer 9 is set in front of the flow meter, and a regulating valve 10 is set between the flow meter and the first condenser; the operation process is to realize the volatilization of light components through heating, and to detect the components on-line in real time to control the heat source valve 8 Opening and closing.
- the flowmeter monitors the flow in real time, and realizes the vacuum stability in the reactor by adjusting the opening degree of the valve and/or the operating frequency of the vacuum unit.
- the first condenser mainly acts as a cooling gas, which is beneficial to maintain the operation of the vacuum pump.
- Regulating valve adjustment and vacuum unit operating frequency adjustment can be selected one or at the same time. Separately adjusting the vacuum unit operating frequency is generally more energy-efficient, and it is determined according to actual conditions. The rest is the same as in Example 1.
Abstract
A variable-pressure desolventizing method. In the method, the temperature of a dual-component or multi-component mixed solution in a desolventizing kettle (1) is raised by means of increasing a heating source, so as to enable light components in the mixed solution to be gasified; the gasification temperature is related to the pressure in the desolventizing kettle (1), and the pressure in the desolventizing kettle is determined by adjustments made to a vacuum pump unit; variable frequency adjustment of the motor speed of the vacuum pump unit is used to adjust the amount of air evacuated, thereby regulating the pressure in the desolventizing kettle (1). The method allows for the highly-effective separation of a multi-component liquid.
Description
本发明涉及一种变压脱溶方法。The invention relates to a variable pressure desolventizing method.
化工生产中涉及多组份混合液体的分离方法较多，采取真空或常压蒸发脱溶是常用分离方法，其主要应用于沸点差异较大的几种液体的初步分离。真空脱溶的优点是可以降低液体的气化温度，但工艺过程难以控制，易产生爆沸，常压脱溶对热媒温度要求较高，且脱溶效率相对较低、能耗高。There are many separation methods involving multi-component mixed liquids in chemical production. Vacuum or atmospheric pressure evaporation desolvation is a common separation method, which is mainly used for the preliminary separation of several liquids with large boiling points. The advantage of vacuum desolventization is that it can reduce the vaporization temperature of the liquid, but the process is difficult to control and easy to produce bumping. Normal pressure desolventization requires higher heat medium temperature, and the desolventization efficiency is relatively low and energy consumption is high.
本发明的目的在于提供一种实现多组份液体高效分离的变压脱溶方法。The purpose of the present invention is to provide a variable pressure desolventization method that realizes high-efficiency separation of multi-component liquids.
一种变压脱溶方法，其特征是：采用变压脱溶工艺装置；所述变压脱溶工艺装置包括依次串联的脱溶釜、气体流量计、第一冷凝器、真空机组、第二冷凝器；第一冷凝器接用于收集第一冷凝器流出的轻组分的第一轻组分收集罐，第二冷凝器接用于收集第二冷凝器流出的轻组分的第二轻组分收集罐；A pressure swing desolventizing method, characterized in that: a pressure swing desolventizing process device is adopted; the pressure variable desolventizing process device includes a desolventizing kettle, a gas flow meter, a first condenser, a vacuum unit, and a second Condenser; the first condenser is connected to the first light component collection tank used to collect the light components flowing out of the first condenser, and the second condenser is connected to the second light component collecting tank used to collect the light components flowing out of the second condenser Component collection tank;
收集于脱溶釜中的双组份或多组份的混合液，通过加热热源加热升温，使其中的轻组份气化，气化温度与脱溶釜中压力相关联，而脱溶釜中的压力通过真空泵组调节确定：真空泵组通过变频调节真空泵组电机转速来调节抽气量，从而调节脱溶釜中压力；The two-component or multi-component mixture collected in the desolventizing kettle is heated by a heating source to vaporize the light components. The vaporization temperature is related to the pressure in the desolventizing kettle, and the desolventizing kettle The pressure is determined by the adjustment of the vacuum pump group: the vacuum pump group adjusts the pumping volume by adjusting the motor speed of the vacuum pump group through frequency conversion, thereby adjusting the pressure in the desolventizing kettle;
起始阶段，由于脱溶釜中轻组份所占比例较大，容易气化，此时，如果高真空蒸发，易发生瞬间蒸发量增大，引发爆沸，气化的轻组份中极可能会夹带重组份，影响轻组份纯度，同时冷凝器冷凝负荷增大，影响冷凝效果，且可能引起物料跑逸，造成损失，并增加尾气处理负荷；为防止以上现象发生，预先设定最大蒸发量：在此蒸发量下不会产生爆沸且确保后续的冷凝器冷凝回收效果较好；由于随着时间的推移，脱溶釜混合液中轻组份含量越来越少，蒸发量有下降的趋势，此时通过变频自动调节真空机组电机转速，提升真空度以维持蒸发量不变；后期随着脱溶釜中轻组份持续减少，脱溶釜中真空即使达到最大值，气化量亦达不到设定的上限，此时维持极限真空蒸发，当气体流量计显示为设定的最小值或在线分析仪显示蒸发轻组份含量低于设定指标，联锁切断加热热源、停真空机组；蒸发气化的轻组份经第一冷凝器及第二冷凝器冷凝后分别回收至第一轻组份收集罐和第二轻组份收集罐。In the initial stage, due to the large proportion of light components in the desolventizer, it is easy to vaporize. At this time, if high vacuum evaporation occurs, an instantaneous increase in evaporation is likely to occur, causing bumping, and the vaporized light components are extremely Recombinant components may be entrained, affecting the purity of light components. At the same time, the condensing load of the condenser increases, which affects the condensing effect, and may cause materials to escape, cause losses, and increase the exhaust gas treatment load; in order to prevent the above phenomenon from happening, set the maximum Evaporation capacity: Under this evaporation capacity, bumping will not occur and the subsequent condenser condensation recovery effect will be better; as time goes by, the content of light components in the desolventizer mixture will become less and less, and the evaporation capacity will be At this time, the motor speed of the vacuum unit is automatically adjusted through the frequency conversion to increase the vacuum to maintain the evaporation rate. Later, as the light components in the desolvation kettle continue to decrease, even if the vacuum in the desolvation kettle reaches the maximum value, the vaporization amount The limit vacuum evaporation is maintained at this time. When the gas flowmeter shows the minimum value or the online analyzer shows that the evaporated light component content is lower than the set index, the interlock will cut off the heating source and stop. Vacuum unit; the evaporated light components are condensed by the first condenser and the second condenser and then recycled to the first light component collection tank and the second light component collection tank.
气体流量计与在线分析仪连接。真空机组采用变频调节电机转速的形式。The gas flow meter is connected to the online analyzer. The vacuum unit adopts the form of frequency conversion to adjust the motor speed.
在线分析仪设置在流量计前，在流量计与第一冷凝器之间设置调节阀；运行过程是通过加热，实现轻组分挥发，在线检测实时监测组分，用于控制热源阀门的启闭。流量计实时监控流量，通过调节阀的开启度和/或真空机组的运行频率，实现反应釜内真空稳定，第一冷凝器主要起冷却气体作用，有利于维持真空泵运行。The online analyzer is set in front of the flow meter, and a regulating valve is set between the flow meter and the first condenser; the operation process is to realize the volatilization of light components through heating, and online detection and real-time monitoring of the components are used to control the opening and closing of the heat source valve . The flowmeter monitors the flow in real time, and realizes the vacuum stability in the reactor by adjusting the opening degree of the valve and/or the operating frequency of the vacuum unit. The first condenser mainly acts as a cooling gas, which is beneficial to maintain the operation of the vacuum pump.
1、本发明可根据待分离混合液体在脱溶过程中相关组份浓度的变化与系统真空度、气化量相关联情况，设定最大瞬时蒸发量，实施变压脱溶，克服了恒压脱溶易产生爆沸或能耗较高、物料损耗相对较大的弊端，有利于提升脱溶分离效率及回收效果。1. The present invention can set the maximum instantaneous evaporation capacity, implement variable pressure desolvation, and overcome the constant pressure according to the correlation between the change in the concentration of related components of the mixed liquid to be separated during the desolventization process and the system vacuum and vaporization capacity. Desolventization is prone to bumping, high energy consumption, and relatively large material loss, which is beneficial to improve desolventization separation efficiency and recovery effect.
2、轻组份回收采用的一、二级冷凝装置分别安装于真空机组前后，前置真空冷凝，后置微正压冷凝把关，确保轻组份能充分回收，减少物料损耗及尾气处理负担。2. The primary and secondary condensing devices used for light component recovery are installed before and after the vacuum unit, with vacuum condensation at the front and micro-positive pressure condensation at the rear to ensure that the light components can be fully recovered, reducing material loss and exhaust gas processing burden.
3、通过真空机组变频调节电机转速，间接调控轻组份蒸发量及系统真空，反映更直观，更易实现自动控制。3. The motor speed is adjusted through the frequency conversion of the vacuum unit, and the light component evaporation and the system vacuum are indirectly adjusted, which is more intuitive and easier to realize automatic control.
4、脱溶系统真空的变化趋势为：由零开始逐渐变大，直到达至设定高值并维持一定的时间，以确保脱溶分离效果。4. The changing trend of the vacuum of the desolventizing system is: from zero to gradually increase, until the set high value is reached and maintained for a certain period of time to ensure the desolventizing and separation effect.
5、脱溶加热热源的温度及能量控制目标：以在确保极限真空下，重组份不蒸发为前提，其余情况可协同真空机组调节脱溶釜混合液中轻组份蒸发量尽可能接近设定的最大蒸发量。5. The temperature and energy control target of the desolventizing heating source: under the premise of ensuring the ultimate vacuum, the reconstituted component does not evaporate, and the other conditions can be coordinated with the vacuum unit to adjust the evaporation of the light component in the desolventizing kettle as close to the setting as possible The maximum evaporation capacity.
6、不同组份的待蒸发脱溶分离的混合液体物料，瞬时最大流量（蒸发量）根据各组份占比情况计算设定，以不产生爆沸，最大限度较少重组份携带及蒸发的轻组份能充分回收为依据。6. The instantaneous maximum flow (evaporation) of the mixed liquid materials of different components to be evaporated, desolventized and separated is calculated and set according to the proportion of each component, so as not to produce bumping, and minimize the carrying and evaporation of the recombined components. The light components can be fully recovered as a basis.
7、在采出轻组份管线设置气体流量计及在线分析仪，有利于脱溶终点的判断及相关工艺参数的优化调整。7. Set up a gas flow meter and an online analyzer in the light-component extraction pipeline, which is conducive to the judgment of the desolvation end point and the optimization and adjustment of related process parameters.
8、该工艺装置用于脱溶釜连续进料，连续脱溶，工艺过程会更稳定，效率会更高。8. The process device is used for continuous feeding of the desolventizing kettle, continuous desolventizing, the process will be more stable and the efficiency will be higher.
9、该工艺装置的目标产品可以是轻组份，也可以是重组份，根据需要设计、设定。9. The target product of the process device can be light component or reconstituted component, which can be designed and set according to needs.
10、该装置投资少，占地面积小，可集成组装，有较好的应用推广前景。10. The device has low investment, small footprint, can be integrated and assembled, and has a good application and promotion prospect.
图1是本发明实施例1中变压脱溶工艺装置的结构示意图。Fig. 1 is a schematic diagram of the structure of the variable pressure desolventization process device in Example 1 of the present invention.
图2是本发明实施例2中变压脱溶工艺装置的结构示意图。2 is a schematic diagram of the structure of the pressure swing desolventizing process device in Example 2 of the present invention.
实施例1：Example 1:
一种变压脱溶方法，采用变压脱溶工艺装置；所述变压脱溶工艺装置包括依次串联的脱溶釜1、气体流量计2、第一冷凝器3、真空机组4、第二冷凝器5；第一冷凝器接用于收集第一冷凝器流出的轻组分的第一轻组分收集罐6，第二冷凝器接用于收集第二冷凝器流出的轻组分的第二轻组分收集罐7。A pressure swing desolventization method adopts a pressure swing desolventization process device; the pressure swing desolventization process device includes a desolventizing kettle 1, a gas flow meter 2, a first condenser 3, a vacuum unit 4, and a second Condenser 5; the first condenser is connected to the first light component collection tank 6 used to collect the light components flowing out of the first condenser, and the second condenser is connected to the first light component collecting tank 6 used to collect the light components flowing out of the second condenser Two light component collection tank 7.
气体流量计与在线分析仪8连接。真空机组采用变频调节电机转速的形式。The gas flow meter is connected to the online analyzer 8. The vacuum unit adopts the form of frequency conversion to adjust the motor speed.
收集于脱溶釜中的双组份或多组份的混合液，通过加热热源加热升温，使其中的轻组份气化，气化温度与脱溶釜中压力相关联，而脱溶釜中的压力通过真空泵组调节确定：真空泵组通过变频调节真空泵组电机转速来调节抽气量，从而调节脱溶釜中压力。The two-component or multi-component mixture collected in the desolventizing kettle is heated by a heating source to vaporize the light components. The vaporization temperature is related to the pressure in the desolventizing kettle, and the desolventizing kettle The pressure is determined by the adjustment of the vacuum pump group: the vacuum pump group adjusts the pumping volume by adjusting the motor speed of the vacuum pump group through frequency conversion, thereby adjusting the pressure in the desolventizing kettle.
起始阶段，由于脱溶釜中轻组份所占比例较大，容易气化，此时，如果高真空蒸发，易发生瞬间蒸发量增大，引发爆沸，气化的轻组份中极可能会夹带重组份，影响轻组份纯度，同时冷凝器冷凝负荷增大，影响冷凝效果，且可能引起物料跑逸，造成损失，并增加尾气处理负荷；为防止以上现象发生，预先设定最大蒸发量：在此蒸发量下不会产生爆沸且确保后续的冷凝器冷凝回收效果较好；由于随着时间的推移，脱溶釜混合液中轻组份含量越来越少，蒸发量有下降的趋势，此时通过变频自动调节真空机组电机转速，提升真空度以维持蒸发量不变；后期随着脱溶釜中轻组份持续减少，脱溶釜中真空即使达到最大值，气化量亦达不到设定的上限，此时维持极限真空蒸发，当气体流量计显示为设定的最小值或在线分析仪显示蒸发轻组份含量低于设定指标，联锁切断加热热源、停真空机组；蒸发气化的轻组份经第一冷凝器及第二冷凝器冷凝后分别回收至第一轻组份收集罐和第二轻组份收集罐。In the initial stage, due to the large proportion of light components in the desolventizer, it is easy to vaporize. At this time, if high vacuum evaporation occurs, an instantaneous increase in evaporation is likely to occur, causing bumping, and the vaporized light components are extremely Recombinant components may be entrained, affecting the purity of light components. At the same time, the condensing load of the condenser increases, which affects the condensing effect, and may cause materials to escape, cause losses, and increase the exhaust gas treatment load; in order to prevent the above phenomenon from happening, set the maximum Evaporation capacity: Under this evaporation capacity, bumping will not occur and the subsequent condenser condensation recovery effect will be better; as time goes by, the content of light components in the desolventizer mixture will become less and less, and the evaporation capacity will be At this time, the motor speed of the vacuum unit is automatically adjusted through the frequency conversion to increase the vacuum to maintain the evaporation rate. Later, as the light components in the desolvation kettle continue to decrease, even if the vacuum in the desolvation kettle reaches the maximum value, the vaporization amount The limit vacuum evaporation is maintained at this time. When the gas flowmeter shows the minimum value or the online analyzer shows that the evaporated light component content is lower than the set index, the interlock will cut off the heating source and stop. Vacuum unit; the evaporated light components are condensed by the first condenser and the second condenser and then recycled to the first light component collection tank and the second light component collection tank.
实施例2：Example 2:
在线分析仪9设置在流量计前，在流量计与第一冷凝器之间设置调节阀10；运行过程是通过加热，实现轻组分挥发，在线检测实时监测组分，用于控制热源阀门8的启闭。流量计实时监控流量，通过调节阀的开启度和/或真空机组的运行频率，实现反应釜内真空稳定，第一冷凝器主要起冷却气体作用，有利于维持真空泵运行。The online analyzer 9 is set in front of the flow meter, and a regulating valve 10 is set between the flow meter and the first condenser; the operation process is to realize the volatilization of light components through heating, and to detect the components on-line in real time to control the heat source valve 8 Opening and closing. The flowmeter monitors the flow in real time, and realizes the vacuum stability in the reactor by adjusting the opening degree of the valve and/or the operating frequency of the vacuum unit. The first condenser mainly acts as a cooling gas, which is beneficial to maintain the operation of the vacuum pump.
调节阀调节与真空机组运行频率调节可二选一或同时，单独调节真空机组运行频率一般来说更节能，具体根据实际情况确定。其余同实施例1。Regulating valve adjustment and vacuum unit operating frequency adjustment can be selected one or at the same time. Separately adjusting the vacuum unit operating frequency is generally more energy-efficient, and it is determined according to actual conditions. The rest is the same as in Example 1.
Claims (4)
- 一种变压脱溶方法，其特征是：采用变压脱溶工艺装置；所述变压脱溶工艺装置包括依次串联的脱溶釜、气体流量计、第一冷凝器、真空机组、第二冷凝器；第一冷凝器接用于收集第一冷凝器流出的轻组分的第一轻组分收集罐，第二冷凝器接用于收集第二冷凝器流出的轻组分的第二轻组分收集罐；A pressure swing desolventizing method, characterized in that: a pressure swing desolventizing process device is adopted; the pressure variable desolventizing process device includes a desolventizing kettle, a gas flow meter, a first condenser, a vacuum unit, and a second Condenser; the first condenser is connected to the first light component collection tank used to collect the light components flowing out of the first condenser, and the second condenser is connected to the second light component collecting tank used to collect the light components flowing out of the second condenser Component collection tank;收集于脱溶釜中的双组份或多组份的混合液，通过加热热源加热升温，使其中的轻组份气化，气化温度与脱溶釜中压力相关联，而脱溶釜中的压力通过真空泵组调节确定：真空泵组通过变频调节真空泵组电机转速来调节抽气量，从而调节脱溶釜中压力；The two-component or multi-component mixture collected in the desolventizing kettle is heated by a heating source to vaporize the light components. The vaporization temperature is related to the pressure in the desolventizing kettle, and the desolventizing kettle The pressure is determined by the adjustment of the vacuum pump group: the vacuum pump group adjusts the pumping volume by adjusting the motor speed of the vacuum pump group through frequency conversion, thereby adjusting the pressure in the desolventizing kettle;起始阶段，预先设定最大蒸发量：在此蒸发量下不会产生爆沸且确保后续的冷凝器冷凝回收效果较好；由于随着时间的推移，脱溶釜混合液中轻组份含量越来越少，蒸发量有下降的趋势，此时通过变频自动调节真空机组电机转速，提升真空度以维持蒸发量不变；后期随着脱溶釜中轻组份持续减少，脱溶釜中真空即使达到最大值，气化量亦达不到设定的上限，此时维持极限真空蒸发，当气体流量计显示为设定的最小值或在线分析仪显示蒸发轻组份含量低于设定指标，联锁切断加热热源、停真空机组；蒸发气化的轻组份经第一冷凝器及第二冷凝器冷凝后分别回收至第一轻组份收集罐和第二轻组份收集罐。In the initial stage, the maximum evaporation capacity is set in advance: under this evaporation capacity, bumping will not occur and the subsequent condenser condensation recovery effect will be better; due to the passage of time, the content of light components in the desolventizer mixture Less and less, the evaporation capacity has a downward trend. At this time, the motor speed of the vacuum unit is automatically adjusted through the frequency conversion to increase the vacuum degree to maintain the evaporation capacity. Later, as the light components in the desolventizing kettle continue to decrease, the vacuum in the desolventizing kettle Even if it reaches the maximum value, the vaporization volume cannot reach the set upper limit. At this time, the ultimate vacuum evaporation is maintained. When the gas flowmeter displays the set minimum value or the online analyzer displays the evaporated light component content lower than the set index , Interlock to cut off the heating source and stop the vacuum unit; the evaporated light components are condensed by the first condenser and the second condenser and then recycled to the first light component collection tank and the second light component collection tank.
- 根据权利要求1所述的一种变压脱溶方法，其特征是：气体流量计与在线分析仪连接。The variable pressure desolventizing method according to claim 1, wherein the gas flow meter is connected with an online analyzer.
- 根据权利要求1或2所述的一种变压脱溶方法，其特征是：真空机组采用变频调节电机转速的形式。A variable pressure desolventizing method according to claim 1 or 2, characterized in that the vacuum unit adopts the form of frequency conversion to adjust the motor speed.
- 根据权利要求3所述的一种变压脱溶方法，其特征是：在线分析仪设置在流量计前，在流量计与第一冷凝器之间设置调节阀；运行过程是通过加热，实现轻组分挥发，在线检测实时监测组分，用于控制热源阀门的启闭。流量计实时监控流量，通过调节阀的开启度和/或真空机组的运行频率，实现反应釜内真空稳定，第一冷凝器主要起冷却气体作用，有利于维持真空泵运行。A variable pressure desolventizing method according to claim 3, characterized in that: the online analyzer is set in front of the flow meter, and a regulating valve is set between the flow meter and the first condenser; The components are volatilized, and the components are monitored on-line and real-time to control the opening and closing of the heat source valve. The flowmeter monitors the flow in real time, and realizes the vacuum stability in the reactor by adjusting the opening degree of the valve and/or the operating frequency of the vacuum unit. The first condenser mainly acts as a cooling gas, which is beneficial to maintain the operation of the vacuum pump.
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