This patent provides a method for utilizing waste PET packaging material. The waste is first crushed and washed, and then the PET is dissolved and decomposed by using a stoichiometric volume of aqueous urea solution or ammonia water at a temperature exceeding 200°C for 30 to 120 minutes. The obtained pure solution of diammonium terephthalate was further distilled under reduced pressure. The bottom material is discharged to recover EG (as a liquid product), and then the crystal of diammonium terephthalate is further reacted with 50% to 96% of sulfuric acid, where the amount of sulfuric acid is used to adjust the pH of the reaction mixture. It is 5. The reaction resulted in a suspension of TPA in ammonium sulfate solution. After crystallization, it is washed with ion-free water, filtered and dried to obtain the desired solid product. The remaining solution was crystallized to give solid ammonium sulfate. The device includes the following equipment: crushing equipment, PET decomposing equipment, EG distillation equipment, TPA precipitation equipment and ammonium sulfate crystallization equipment.
Source: Polyester Industry
Drop in cast iron bathtubs are very popular. They're used in family bathrooms and hotels. The body of porcelain enamel cast iron bathtub is made of cast iron. And grade of porcelain enamel is A. Drop in bathtub also called build in bathtub, can be made in many different sizes and shapes. All drop in bath tubs are with legs and some items can be with handles.
Bathtub Length 1200-1400 Mm,1200-1400Mm Bathtubs,Bathtub Sizes 1400 Mm,1200-1400Mm Freestanding Bath Tub
Anping Sunshine Sanitary Ware Co., Ltd. , https://www.sunshinebathtubs.com