Pentaerythritol
Pentaerythritol;2,2-Bis(hydroxymethyl)-1,3-propanediol;Tetrakis(hydroxymethyl)methane;Tetramethylolmethane;Pentaerythrite;1,3-Propanediol, 2,2-bis(hydroxymethyl)- 
Molecular formula : C5H12O4
MW : 136.15
CAS No. :134-77-5

nature : the white crystalline powder. 261-262 ° C melting point, boiling point of 276 ° C (4.0 kPa), the relative density of 1.399 (25 / 4 ° C), the refractive index of 1.548, lighted <370 ° C, thermal gasification <92kJ/mol, sublimation thermal 131.5kJ/mol . General vulnerability organic acid esterification, and dilute solution of caustic soda, into no response. 15 ° C1g soluble in water recharges, 100g97 ° C in the hot water soluble 77.2g of the goods. Soluble ethanol, glycerine, ethylene glycol, formamide. Insoluble acetone, benzene, carbon tetrachloride, ether and petroleum ether.

Preparation Methods : formaldehyde and acetaldehyde as raw materials, reduction in alkaline reaction mixture derived existence. When using sodium hydroxide as the condensing agent, known as sodium law. The molar ratio of raw material to acetaldehyde : Formaldehyde : alkali = 1.5:6:1.1-1.3. Sodium hydroxide solution will join the 37% formaldehyde solution, the mixing add acetaldehyde, in response to 25-32 ° C 6-7h. Via and filter derived pentaerythritol. The consumption of raw materials fixed : formaldehyde (37%) 2880kg / t, acetaldehyde Barley / t. When using calcium hydroxide for condensing agent, known as calcium. The molar ratio of raw material to acetaldehyde : Formaldehyde : lime = 1:4.7:0.7-0.8. Will formaldehyde, acetaldehyde solution of 20% and 25% of the milk of lime joined 11:50, 60 ° C in the following reaction, condensation liquid color change from green ash. Gradually cooling to 45 ° C Add acidification pot. With 60-70% of the sulfuric acid solution so that condensation to the pH range of 2-2.5, and then use the filter press down to calcium sulfate. Filtrate efficiency by ion exchange column to remove residual calcium, drought OK vacuum concentration, gas temperature maintained at 70 ° C under vacuum at 77.3kPa. Crystal began to arise, it will be condensed into liquid crystal shafts, stirring cooling and crystallization, centrifugal separation and washing to pH 3, wetlands by air drying products derived products. Calcium consumption, waste were also many problems. The consumption of raw materials fixed : formaldehyde (36.5%) 4700kg / t, acetaldehyde 550kg / t.

purposes : Pentaerythritol mainly used in paint industry, is the alkyd resin coating raw materials, enables the membrane coating hardness, luster and durability can be improved, it also used as varnish, paint and printing ink needed for the rosin resin raw materials, the system can Yam-flammable coating, dry Fang oil and lubricants air. Pentaerythritol the 272 is a potent explosives (ie too Security); Its fatty acid esters are efficient lubricants and PVC plasticizers; Their epoxy derivatives is from the production of surface-active agents of raw materials, pentaerythritol easy authority and metal forming complex in detergent formulations are as hard water soft agent used, in addition, also in medicine, pesticides and other production.