Aliazrin

Product description:It is orange yellow piece of crystal or powder. 288-289 ° C melting point, boiling point of 430 ° C. Soluble in hot methanol and 25 ° C ether. Soluble benzene, acetic acid, pyridine, carbon disulfide, micro-soluble in water. 
CAS No.:72-48-0
Synonyms: 1,2-Dihydroxyanthraquinone; 
Molecular formula: C14H8O4  
Moleular weight : 240.20
Preparation Methods : Alizarin exist in the natural world madder root. Will anthraquinone-2-sulfonic acid and caustic soda and potassium nitrate or potassium chlorate eutectic and then dumped into melt-water, recycling of hydrochloric acid precipitation derived Alizarin : 9g potassium chlorate and 30g anthraquinone-2-110g sodium hydroxide and sodium with water-soluble tha, the heat autoclave at 170 ° C Heating 25g. Cold-water reaction after extracting several times, each 150ml. Water Extract filter and the filtrate with hydrochloric acid. After cooling Suction precipitation of precipitation, washing, drying, Alizarin of about 20g. 
Purposes : dye intermediates, acid-base indicator