LIQUID-PHASE DEHYDRATION OF METHYLPHENYLCARBINOL AND HIGH-BOILING COMPONENTS FOR STYRENE PRODUCTION
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Urgenchskiy gosudarstvennyy universitet imeni Abu Rayhana Beruni
2.
KNITU
3.
KNITU
4.
KNITU
Type:
Article
Pages:
from 34
to 39
Status:
Published
Received:
03.03.2026
Accepted:
27.03.2026
Published:
05.05.2026
Language:
Russian
Keywords:
STYRENE, METHYLPHENYL CARBINOL, HIGH-BOILING COMPONENTS, HIGH-BOILING AROMATIC ETHERS, DEHYDRATION, SULFAMIC ACID, LIQUID-PHASE PROCESS
Abstract:
The process of joint dehydration of high-boiling components (HBC) formed at various units of the dehydration process of methylphenyl carbinol (MPC) in the joint production of styrene and propylene oxide, and the MFC fraction in the presence of sulfamic acid was studied. It was shown that joint dehydration of HBC and the MFC fraction in the presence of sulfamic acid leads to an increase in the styrene content in the decomposition products (60.29 %) compared to the dehydration of the MFC fraction (52.19 %). In this case, complete conversion of MFC and HBC is not achieved. By introducing live steam into the bottom part of the dehydrator, a styrene fraction containing at least 95.55 % by weight of the main substance was obtained from a mixture of the methylphenylcarbinol fraction and high-boiling components. The mixture was dehydrated continuously in a specially designed laboratory unit with separate collection of low-boiling and high-boiling reaction products. Qualitative and quantitative analysis of dehydration products was performed by chromatographic-mass spectrometry on Agilent 5975 Series MSDs. Mass spectra were obtained at an ionizing ion energy of 69 eV. It was found that introducing live steam into the dehydration reactor allows achieving high conversion of methylphenylcarbinol and high-boiling aromatic ethers and selectivity of styrene formation due to its immediate separation from the reaction zone. The mass ratio of water vapor: batch = 64:100 was found, ensuring maximum styrene extraction.
The process of joint dehydration of high-boiling components (HBC) formed at various units of the dehydration process of methylphenyl carbinol (MPC) in the joint production of styrene and propylene oxide, and the MFC fraction in the presence of sulfamic acid was studied. It was shown that joint dehydration of HBC and the MFC fraction in the presence of sulfamic acid leads to an increase in the styrene content in the decomposition products (60.29 %) compared to the dehydration of the MFC fraction (52.19 %). In this case, complete conversion of MFC and HBC is not achieved. By introducing live steam into the bottom part of the dehydrator, a styrene fraction containing at least 95.55 % by weight of the main substance was obtained from a mixture of the methylphenylcarbinol fraction and high-boiling components. The mixture was dehydrated continuously in a specially designed laboratory unit with separate collection of low-boiling and high-boiling reaction products. Qualitative and quantitative analysis of dehydration products was performed by chromatographic-mass spectrometry on Agilent 5975 Series MSDs. Mass spectra were obtained at an ionizing ion energy of 69 eV. It was found that introducing live steam into the dehydration reactor allows achieving high conversion of methylphenylcarbinol and high-boiling aromatic ethers and selectivity of styrene formation due to its immediate separation from the reaction zone. The mass ratio of water vapor: batch = 64:100 was found, ensuring maximum styrene extraction.
Keywords:
STYRENE, METHYLPHENYL CARBINOL, HIGH-BOILING COMPONENTS, HIGH-BOILING AROMATIC ETHERS, DEHYDRATION, SULFAMIC ACID, LIQUID-PHASE PROCESS
STYRENE, METHYLPHENYL CARBINOL, HIGH-BOILING COMPONENTS, HIGH-BOILING AROMATIC ETHERS, DEHYDRATION, SULFAMIC ACID, LIQUID-PHASE PROCESS
