1.4-1 DMMn Quality Index

Project	Index
DMMn Content	>99.5%
Methanol	＜0.5%
Methylal Content	＜0.01%
Appearance	colorless, transparent
Sulfur Content	＜1ppm
Chlorine Content/td>	＜1ppm
Acidity	≤7(mgKOH/100ml)

1.7-1 Raw Material,Utilities Consumption Quota

NO.	Name	Consumption quota
1	Methanol	1.4 t/t
2	Auxiliary Agent	10 kg/t
3	Steam	3.5 t/t
4	Process Water	1.2 t/t
5	Primary Water	6.3 t/t
6	Circulating Water	245.2 t/t
7	Industrial Electricity	200 kWh/t
8	Instrument Air	~32 Nm3/t
9	Nitrogen (purge)	~60 Nm3/hr

Process Drawing

ProcessEquipment Layout DrawThe chemical name of DMMn is PODE and Polyoxymethylene dimethyl ethers etc. The  molecule short form can be expressed asing CH3O（CH2O）nCH3，and the general value selection of n is 2~8. DMMn has better oxygen content (（wt%：42%~51%）and higher Cetane number（≥60, when it is added to the diesel , the diesel flame quality in engineer the can be obviously improved , the thermal efficiency can be improved and the pollution emission can be decreased. Thus it is recognized as the most promising diesel additive

1.1-1 DMMn Basic physical and chemical properties

Name	Boiling Point/℃	Oxygen Content/%	Cetane number	Flash point/℃	Proportion
DMM2	105	45.3	63	23	0.9597
DMM3	156	47.1	78	59	1.0242
DMM4	202	48.2	90	65	1.0671
DMM5	242	49.0	100	78	1.1003
DMM6	280	49.6	104	90	1.1004
DMM7	313	50.0	104	~90	1.1006
DMM8	320	50.3	106	~90	1.1009

1.1-2 Main physical and chemical specifications of DMMn and blended diesel

Technical Index	Sample Name
（Unit）	Routine diesel	DMMn	blended diesel
Density/（g/cm3）	0.833	1.031	0.852
kinematic viscosity/（mm2/s）	4.97	1.40	3.11
closed-cup flash point/（℃）	68	48	55
copper corrosion	1	1	1
cold filter plugging point/（℃）	10	-20	10
Cetane number	43	65	48

1.1-3 Vehicle Test Data

Technical Index	Sample Name
（Unit）	0#diesel	5%DMMn	10%DMMn	15%DMMn
Actual max wheel power	39.88 kW	43.15 kW	42.79 kW	42.66 kW
smoke intensity reduce value	0.0%	17.8%	27.7%	46.1%

1.1-4 Rack Test Data

Test item	Emission	National III Diesel	10%DMMn blended diesel	Deviation%
ESC	CO    【g/kW·h】	1.88	1.56	-17.02
	THC  【g/kW·h】	0.15	0.14	-6.67
	NOx 【g/kW·h】	8.37	8.94	+6.81
	PM   【g/kW·h】	0.05	0.03	-40.0
ELR	smoke intensity 【m-1】	0.46	0.22	-52.17
Remark：Deviation=(10%DMMnblended diesel-national III diesel)/national III diesel×100%

From the above tables, we can see clearly that DMMn has excellent physical and chemical   performance parameter.Once 5%~15% of DMMn is added into the diesel, cetane number and engine efficiency  in the diesel will be increased effectively,in turn reducing the emissions in the off-gas like PM、CO、NOx.

DMMn is mainly used for the diesel fuel additive to improve cetane number,reducing the discahrging of noxious gas ；the best added value should be: 3≤n≤5，appending proportion should be 5%-15%

DMM2, being the good diesel blending component under low-temperature environment,whose boiling point is 105℃，melting point is -69.7℃，flashing point is 23℃ can reduce the freezing point of diesel effectively ;Meanwhile,DMM2 is good clean solvent without aromatic hydrocarbon、cyclic hydrocarbon which can replace the clean organic solvent of benzene and methylbenzene,practical value of DMM2 is very high.

This process adopt formaldehyde and methylal as the raw material to compound DMMn,main equipments are:one set of methanol to formaldehyde plant,one set of methylal plant,one set of DMMn plant.

（1）Refine Formalin
50% concentration formaldehyde enter the climbing film evaporator to get preheated and then come inside the separator to do the vacuum flashing concentration,after it is concentrated to 75%, it is sent to the DMMn Compounding Unit through pump.

（2） DMMn Compounding Unit
The mixed formaldehyde and methylal from refining unit come into the reacting unit first,the reaction mass will go through heavy removing column later and  product of column reactor will create DMM3-4 and little heavy constituent products after it is separated. heavy constituent enter the polymerization unitto get to get reacted again.

（3）Purge gas absorption unit
All the purge gas of the factory will enter the purge gas absorptioncolumn,top water of dehydrating towerⅡwill be used as the absorption water meanwhile ,the absorbed the solution consisting of methylal、methanol and formaldehyde will enter the methylal unit.

Jiangsu Kaimao Chemical Technology Co.,Ltd devote itself to offer a complete set of coal derived clean energy ,whose PODE preparation technology cost least in china ,pls see its process features as below：

1）Adopt solid acid catalyst whose service life is much longer and is much easier to separate itself from the product.

2）Adopt formaldehyde as raw material whose cost is the lowest.

3）Cause Paraformaldehyde and trioxymethylene plant needn’t be constructed here, the building cost of projects reduce a lot.

4）The most advanced silver contact formaldehyde&high concentration methylal technology is integrated in our company,especially the plant process waste reach domestic first class discharge standard

5）Consumption of material and utilities stays a leading level.

https://drive.google.com/file/d/10KBwOv9OzV2C2gmK-5ZWADx9veC4MvwR/view?usp=sharing