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Online analysis scheme for furfural in steam
Online analysis scheme for furfural in steam
Product details
Online analysis scheme for furfural in steam
1、 Preface:
Furfural, also known as furfural, is a colorless liquid with a unique aroma. It is one of the main raw materials in the organic synthesis chemical industry. It has a wide range of applications, including the manufacture of rubber, plastics, synthetic fibers, pesticides, pharmaceuticals, coatings, chemical reagents, and various additives. In addition, the residue from furfural production can be used as fertilizer, which has a good effect on improving saline alkali land and enhancing soil fertility. The raw materials for producing furfural are abundant. These raw materials are mainly agricultural and sideline products, such as oat shells, corn cobs, cottonseed hulls, rice husks, peanut shells, buckwheat shells, corn stalks, and wheat straw. Among them, corn cob has a higher formaldehyde yield, with a theoretical formaldehyde yield of 19%, which can fully utilize corn cob to produce furfural.
Due to various factors such as resources, labor, and environment involved in furfural production, some developed countries shifted their furfural production enterprises to developing countries at the end of the last century due to environmental and production cost issues. China is currently a developing country, and due to resource and labor costs, its furfural prices are highly competitive internationally. With the sharp increase in furfural exports, it has gained an increasingly large share in the international market and has become the world's largest producer and exporter of furfural,
2、 Purpose of testing
The steam consumption is the main consumption indicator of the furfural hydrolysis process, and reducing the steam consumption is of great significance for the economic value of the product. Steam contains some organic compounds such as furfural, and their content is uneven. According to the change in furfural content in steam, the steam size can be changed (with high furfural content, the steam opening should be increased, and with low furfural content, the steam opening should be decreased) to reduce steam consumption and save costs.
3、 Steam components
3.1 Water vapor is about 70-80%;
3.2 Furfural 0-10%;
3.3 Hydrogen chloride 0-10%;
3.4 Acetic acid 0-1%;
3.5 furfuryl alcohol 0-1%;
3.6 Furans 0-1%;
3.7 Other organic compounds 0-5%.
4、 Testing equipment
4.1 GC-9860 gas chromatograph with TCD and FID (FID has split/non split and tail blowing devices);
4.2 Gas automatic injection device, 0.5-1ml quantitative loop;
4.3 Separation device: capillary column, packed column;
4.4 Heating auxiliary device: pipeline heating belt, heating control device;
4.5 Data processing system, industrial computer;
4.6 Nitrogen, hydrogen, air, etc.
The gas chromatograph is the core equipment of the entire system, the industrial computer is the control part of the system, and the others are auxiliary equipment; Capillary columns and packed columns are consumables.
5、 Testing conditions
5.1 Steam outlet conditions for furfural production equipment
5.1.1 Gas temperature: 150-200 ℃
5.1.2 Gas pressure: atmospheric pressure -0.3Mpa
5.1.3 Gas flow rate: maximum 1500ml/s
5.2 Chromatographic conditions:
5.2.1 Column temperature: 135 ℃
5.2.2 Gasification temperature: 220 ℃
5.2.3 FID detector temperature: 200 ℃
5.2.4 TCD detector temperature: 160 ℃
5.2.5 FID carrier gas: nitrogen, flow rate of 20 mL/min
5.2.6 Hydrogen flow rate: 30 mL/min
5.2.7 Air flow rate: 250 mL/min
5.2.8 TCD carrier gas: hydrogen, flow rate of 35 mL/min
detection scheme
During the hydrolysis process of corn cob and acid reaction, there are many steam components with low and high waste content. It is necessary to quickly detect changes in the content of various components in steam and shorten the analysis time. Most of the steam is water, which can be detected by a thermal conductivity detector. However, the thermal conductivity detector can only perform constant analysis, and some trace low boiling point and high boiling point substances cannot be detected by the thermal conductivity detector. Obviously, using a thermal conductivity detector for detection cannot fully meet the expected requirements. So the hydrogen flame detector has high sensitivity and can detect trace or even trace amounts of organic matter, but water does not respond on the hydrogen flame detector. Obviously, using a hydrogen flame detector for detection cannot fully meet the expected requirements. Our company conducts research on continuous steam detection according to the requirements of furfural production enterprises; Using a single injection hydrogen flame and a thermal conductivity detector, detect all components in the steam. Steam quickly condenses into a liquid state at room temperature, so sampling bags cannot be used for sampling. We use pipeline and valve heating method, requiring the pipeline and valve to reach the steam temperature, and there should be no condensation of steam in the pipeline and valve. The ten way valve switches the gas path for sampling.
Figure 1 and Figure 2
Sampling status of ten way valve (Figure 1); Steam flows into heating pipeline A from the production equipment, enters ten way valve 1, exits through ten way valve 10 and enters quantitative ring C, flows through ten way valves 7 and 6, then enters quantitative ring D, passes through ten way valves 3 and 2, and finally empties through B.
Ten way valve injection status; The valve handle is driven to rotate (Figure 2) by the driving motor. Nitrogen enters 10 through valve 9 and then flushes the steam component in quantitative ring C. It enters 8 through valve 7 and then enters the inlet end of FFAP capillary column. After a certain column length, the steam component is separated and finally enters the hydrogen flame for detection. Detecting components (furfural, furan, low boiling point organic compounds). Hydrogen gas enters 6 through valve 5 and then flushes the steam component in quantitative ring D. It enters 4 through valve 3 and then enters the inlet end of the GDX stainless steel packed column. After a certain column length, the steam component is separated and finally enters the thermal conductivity detector for detection. Detecting components (water vapor, hydrogen chloride, acetic acid, acetals).
The entire operating system is controlled by a microcomputer and automatically sampled on a periodic basis, without the need for manual staff to stay on duty. Data is automatically saved and retrieved.
1、 Preface:
Furfural, also known as furfural, is a colorless liquid with a unique aroma. It is one of the main raw materials in the organic synthesis chemical industry. It has a wide range of applications, including the manufacture of rubber, plastics, synthetic fibers, pesticides, pharmaceuticals, coatings, chemical reagents, and various additives. In addition, the residue from furfural production can be used as fertilizer, which has a good effect on improving saline alkali land and enhancing soil fertility. The raw materials for producing furfural are abundant. These raw materials are mainly agricultural and sideline products, such as oat shells, corn cobs, cottonseed hulls, rice husks, peanut shells, buckwheat shells, corn stalks, and wheat straw. Among them, corn cob has a higher formaldehyde yield, with a theoretical formaldehyde yield of 19%, which can fully utilize corn cob to produce furfural.
Due to various factors such as resources, labor, and environment involved in furfural production, some developed countries shifted their furfural production enterprises to developing countries at the end of the last century due to environmental and production cost issues. China is currently a developing country, and due to resource and labor costs, its furfural prices are highly competitive internationally. With the sharp increase in furfural exports, it has gained an increasingly large share in the international market and has become the world's largest producer and exporter of furfural,
2、 Purpose of testing
The steam consumption is the main consumption indicator of the furfural hydrolysis process, and reducing the steam consumption is of great significance for the economic value of the product. Steam contains some organic compounds such as furfural, and their content is uneven. According to the change in furfural content in steam, the steam size can be changed (with high furfural content, the steam opening should be increased, and with low furfural content, the steam opening should be decreased) to reduce steam consumption and save costs.
3、 Steam components
3.1 Water vapor is about 70-80%;
3.2 Furfural 0-10%;
3.3 Hydrogen chloride 0-10%;
3.4 Acetic acid 0-1%;
3.5 furfuryl alcohol 0-1%;
3.6 Furans 0-1%;
3.7 Other organic compounds 0-5%.
4、 Testing equipment
4.1 GC-9860 gas chromatograph with TCD and FID (FID has split/non split and tail blowing devices);
4.2 Gas automatic injection device, 0.5-1ml quantitative loop;
4.3 Separation device: capillary column, packed column;
4.4 Heating auxiliary device: pipeline heating belt, heating control device;
4.5 Data processing system, industrial computer;
4.6 Nitrogen, hydrogen, air, etc.
The gas chromatograph is the core equipment of the entire system, the industrial computer is the control part of the system, and the others are auxiliary equipment; Capillary columns and packed columns are consumables.
5、 Testing conditions
5.1 Steam outlet conditions for furfural production equipment
5.1.1 Gas temperature: 150-200 ℃
5.1.2 Gas pressure: atmospheric pressure -0.3Mpa
5.1.3 Gas flow rate: maximum 1500ml/s
5.2 Chromatographic conditions:
5.2.1 Column temperature: 135 ℃
5.2.2 Gasification temperature: 220 ℃
5.2.3 FID detector temperature: 200 ℃
5.2.4 TCD detector temperature: 160 ℃
5.2.5 FID carrier gas: nitrogen, flow rate of 20 mL/min
5.2.6 Hydrogen flow rate: 30 mL/min
5.2.7 Air flow rate: 250 mL/min
5.2.8 TCD carrier gas: hydrogen, flow rate of 35 mL/min
detection scheme
During the hydrolysis process of corn cob and acid reaction, there are many steam components with low and high waste content. It is necessary to quickly detect changes in the content of various components in steam and shorten the analysis time. Most of the steam is water, which can be detected by a thermal conductivity detector. However, the thermal conductivity detector can only perform constant analysis, and some trace low boiling point and high boiling point substances cannot be detected by the thermal conductivity detector. Obviously, using a thermal conductivity detector for detection cannot fully meet the expected requirements. So the hydrogen flame detector has high sensitivity and can detect trace or even trace amounts of organic matter, but water does not respond on the hydrogen flame detector. Obviously, using a hydrogen flame detector for detection cannot fully meet the expected requirements. Our company conducts research on continuous steam detection according to the requirements of furfural production enterprises; Using a single injection hydrogen flame and a thermal conductivity detector, detect all components in the steam. Steam quickly condenses into a liquid state at room temperature, so sampling bags cannot be used for sampling. We use pipeline and valve heating method, requiring the pipeline and valve to reach the steam temperature, and there should be no condensation of steam in the pipeline and valve. The ten way valve switches the gas path for sampling.
Figure 1 and Figure 2
Sampling status of ten way valve (Figure 1); Steam flows into heating pipeline A from the production equipment, enters ten way valve 1, exits through ten way valve 10 and enters quantitative ring C, flows through ten way valves 7 and 6, then enters quantitative ring D, passes through ten way valves 3 and 2, and finally empties through B.
Ten way valve injection status; The valve handle is driven to rotate (Figure 2) by the driving motor. Nitrogen enters 10 through valve 9 and then flushes the steam component in quantitative ring C. It enters 8 through valve 7 and then enters the inlet end of FFAP capillary column. After a certain column length, the steam component is separated and finally enters the hydrogen flame for detection. Detecting components (furfural, furan, low boiling point organic compounds). Hydrogen gas enters 6 through valve 5 and then flushes the steam component in quantitative ring D. It enters 4 through valve 3 and then enters the inlet end of the GDX stainless steel packed column. After a certain column length, the steam component is separated and finally enters the thermal conductivity detector for detection. Detecting components (water vapor, hydrogen chloride, acetic acid, acetals).
The entire operating system is controlled by a microcomputer and automatically sampled on a periodic basis, without the need for manual staff to stay on duty. Data is automatically saved and retrieved.
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