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99.5 Concentration Process
Performance
Performance - 99.5% Concentration Process
No. Item Rate of expenditure/th> Remark
Raw material and auxiliary material
1 Formaldehyde(37%) 1.06T/T
2 Methanol(99.5%) 0.84T/T
Utilities
1 Industrial feeding water t≤25℃ Intermittent flushing
2 Circulating water t≤32℃,△t=8℃, Circulating quantity per hour 115.2T/T
3 Power(380V) 60kWh/T
4 Low pressure steam P=0.25MPa(G) 750kg/T
Medium pressure steam P=0.8MPa(G) 550kg/吨
Process Digram&Layout Drawing
工艺流程图

设备布置图
References
Project Type and parameter Production line Finish date
Wuhan Jiazhou SSTPC 10000tpa98.5% methylal plant 1 2010.4
Fujian Changqing Chemical Co., Ltd 30000tpa methylal plant 1 2010.5
Shandong Tuobo Haoyuan Chemical Co., Ltd 30000tpa methylal plant 1 2010.5
Sanming Jifu Chemical Co., Ltd 50000tpa methylal plant 1 2010.8
Chengdu Liantai Chemical Co., Ltd 20000tpa methylal plant 1 2010.8
Wuhan Jiazhou SSTPC 1000tpa methylal plant 1 2010.10
Maoming City ZhongguangChemical Co., Ltd 60000tpa formaldehyde plant
30000tpa methylal plant
2 2010.11
Fengkai County Yide Chemical Co., Ltd 30000tpa99.9%High concentrations of methylal plant 1 2010.12
Shandong Shengtong Bloc Co. Ltd. 100000tpa formaldehyde plant
High concentrations of methylal plant
2 2011.1
Longkou Haili Chemical Plant 30000tpa formaldehyde plant
10000tpa methylal plant
2 2011.4
Jiangsu Sanmu Bloc Co. Ltd. 50000tpa 99.5%High concentrations of methylal plant 1 2011.4
Kunming Jingao Chemical Co. Ltd. 10000tpa methylal plant 1 2011.5
Wenan County Lilong Chemical Plant 30000Tpa formaldehyde plant 1 2011.6
Shandong Dianshang Chemical Plant 100000Tpa formaldehyde plant 1 2011.6
Maoming City Zhongguang Chemical Co., Ltd 60000Tpa formaldehyde plant
30000tpa High concentrations of methylal plant
2 2011.6
Hebei Jingtaida Chemical Co., Ltd 100000tpa methylal plant 1 2011.10
Shandong Chenxin New Energy Co. Ltd. 10000tpa methylal plant 1 2011.11
Ninxia Xinao Chemical Co., Ltd 20000tpa methylal plant 1 2011.11
Wenan County Pacific Chemical Co., Ltd 80000tpa formaldehyde plant;
60000tpa methylal plant
2 2012.07
Shandong Chenxin New Energy Co. Ltd. 10000tpa methylal plant 1 2012.09
Guangdong Maoming City Zhongguang Chemical Co., Ltd 80000High concentrations of methylal plant 1 2013.01
Guangdong Maoming City Zhongguang Chemical Co., Ltd 60000tpa formaldehyde plant 1 2013.01
Xianyang Hongyuan Chemical Co., Ltd 60000tpa formaldehyde plant and 60000tpa High concentrations of methylal plant 2 2013.02
Jilin Sengong Chemical Co., Ltd 50000tpa 55%formaldehyde plant tpa 55%formaldehyde plant
30000tpa High concentrations of methylal plant
2 2013.12
Chengdu Tianfeng SSTPC 20000tpa High concentrations of methylal plant 1 2014.01
Shandong Yiyuan SSTPC 15000tpa High concentrations of methylal plant 1 2014.06
Xinjiang Hengyang Chemical Co., Ltd 100000tpa formaldehyde plant and 50000tpa methylal plant 2 2014.06
Overview
Overview - 99.5% Concentration Process
Owing to the azeotrope from methylal , formaldehyde and water, adopting the normal rectification method cannot get high concentration methylal. Kaimao company, on the base of the original process for normal concentration methylal , has successfully researched the high concentration methylal process, via many tests and technical designs, making methylal purity to reach 99.5%.

1.Concentration of 90% methylal preparing unit
This unit is the same technology with 85%-92% methylal process, and the only difference is that 3# Pressurized Tower top gas is used to heat the tower bottom liquid of 1# Reaction Tower.

2. Concentration of 99.5% methylal preparing unit

Methyal with concentration about 90% is pumped by the high pressure pump into 3# Pressurized Tower. The tower bottom reboiler is heated by steam, with the tower controlled in a certain pressure. The liquid withdrew from the tower bottom is 99.5% methylal. The gas from the tower top firstly comes into 2# condenser for condensation; the released heat is used as the heat source of 1# reaction tower. The condensed liquid comes into 2# Reflux Drum, and part of it will be back flowed to 3# Pressurized Tower, other parts will be put to 4# Recovery Tower.

3.Methanol recycling unit

Most part of the liquid in 2# Reflux Drum is methylal, with litter methanol. Part of this liquid will be sent to the 4# Recovery Tower. The tower bottom reboiler is heated by the steam. The liquid withdrew from the tower bottom is high purity methanol, which can be sent to Mixer for continuous reaction. Part of the gas phase from the tower top after condensation will be back flowed to 4# Recovery Tower, other parts will be sent to 1# Reflux Drum for the continuous rectification.

Technology feature:
Exclusively create the pressure adding rectification technology to make high concentration methylal , which is very technically and economically efficient.
pdf
https://drive.google.com/file/d/1h_VGszjpCMYRtBsf3dlXBzsjOjUdSqpg/view?usp=sharing
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