Operation rate of POM unit reached 101% in Oct. of 2013 and the qualification rate of product reached 96.41%, both satisfying design requirement.
At the end of 2010, using the existing utilities and methanol, steam, a polyoxymethylene plant with an annual capacity of 55,000 tons was added.
In February 2015, a decision was made to shut down the plant for the following two main reasons:
(1) Unstable running of critical equipment like polymerizer and high-pressure concentrating column caused poor product quality; (2) POM market prices continued to slump.
The design capacity of this POM plant is 55,000tpy of POM pellet on the basis of 8000 operating hours per year.
Formaldehyde concentration and trioxymethylene synthesis section has 3 independent production lines. DOX section has 2 production lines. POM section has 5 production lines.
The POM plant consists of three production lines, each of which includes formaldehyde concentration unit (S0 unit), trioxymethylene unit (T0 unit) and polymerization (Y0) unit. Aside from the above units, there is one production line includes another butyral production unit (Q5 unit) and another polymerization catalyst preparation unit (Y8 unit); two production lines have dioxolane production unit (Q0); three production lines share a packaging unit (W0 unit). The following are the details of each unit:
1) S0 unit: formaldehyde concentration unit, include the following three sections:(1) Formaldehyde concentration in vacuum(2) Formaldehyde recovery(3) Dilute formaldehyde concentration under higher pressure
2) To unit: trioxymethylene unit, include the following seven sections:(1) Trioxymethylene Synthesis(2) Light phase separation(3) Trioxymethylene concentration(4) Trioxymethylene crystallization(5) Trioxymethylene crystallization separation and melting(6) Trioxymethylene extraction(7) Trioxymethylene distillation(8) Waste gas conveying 3) Q0 unit: butyral and dioxolane production unit, include the following five sections:(1) Dioxolane synthesis(2) Dioxolane extraction(3) Dioxolane distillation(4) Alkali liquor regeneration(5) Butyral synthesis and distillation 4) Y0 unit: polymerization unit, include the following eight sections:。(1) Trioxymethylene polymerization(2) Polymer grinding and passivation(3) Monomer separation(4) Polymer stabilization(5) Polymer degassing and pelleting(6) Degassing and absorption(7) Trioxymethylene recovery(8) Polymerization catalyst preparation
5) W0 unit: packaging unit
Expected utility consumption under design capacity:
Utility Specification Unit ratio (ton) Steam t 0.50MPa(G) 12.4 Desalted water t 0.9 Circulating cooling water m3 30℃，△T=10°C 970.0 Circulating low-temp water kcal 5℃, △T=5°C 280000 Circulating cold water kcal -11℃，△T=3.5°C 190000 Electricity kWh 6000, 380, 220V 795.0 Nitrogen(99.9%) Nm3 0.6 MPa(G) 150.0 Instrument air Nm3 0.6 MPa(G) 120.0 Plant air Nm3 0.6 MPa(G) 300.0 Note: Steam and electricity used for tracing heat, jacket hot water, vent system and illumination are not included.
The formaldehyde unit selected an Iron-molybdenum-oxide catalyst formaldehyde production technology.
POM unit selected a formaldehyde copolymer technology. No license issues and client can use the technology license.
Raw Material Consumption
Expected unit ratio under design capacity:
Raw material Specification Unit ratio (ton) Formaldehyde 45%wt 1.09 (calculate as 100%wt) Ethylene glycol(kg) 99.5%wt 35.0
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