Wansi waliwo okufulumya Papi .
PAPI (crude MDI) is produced in the same manner as MDI except that the ratio of the amount of aniline to hydrochloric acid is smaller. The synthesis of PAPI and MDI-like are carried out in two steps. First, the aniline and formaldehyde solution (formalin) is condensed into a polyamine mixture containing a certain amount of diamine under the action of a Lewis acid, and then the polyamine compound is subjected to Phosgenation reaction okufuna PAPI. Mu kusengejja ebirungo bya polyamine, ebirimu diamine bifugibwa okuba nga 50%. okutwalira awamu, kiyinza okutuukibwako nga tutereeza omugerageranyo gw’omuwendo gw’ebiyingizibwa by’ebintu ebibiri ebisookerwako ebya aniline ne formaldehyde, kwe kugamba, omuwendo gwa ekirungo kya an an 1: 1: an an an an an an an an an an 1: an an an an an an, the is, omuwendo gwa an, 1: 1: , omuwendo gwa an 1: , omuwendo gw’ebintu ebisookerwako, omuwendo gw’ebintu, omuwendo gwa ana, bwe gutyo, omuwendo gwa an, gwe gulina ekirungo kya an, kwe kugamba, omuwendo gw’ebintu ebisookerwako, omuwendo gwa 1: Ebitundu nga 50% ebya diamine mu kirungo kya polyamine ekikoleddwa. n’olwekyo, omugerageranyo gw’okugabanya ekibinja ky’ebintu ebisookerwako, okutwalira awamu omugerageranyo gw’omuwendo gwa aniline ne formaldehyde guli 1.6 okutuuka ku 2. enkyukakyuka za O, embeera endala ez’okukola ez’okukola ekirungo kya MDI zifaanagana n’ezo eza MDA {16} ekirungo kya PALINI ekyetaagisa okukola ekirungo kya MDI era nga kikolebwa mu nkola ya PAYPI n’enkola ya PAYPI eyeetaagisa okukola ekirungo kya MDI n’enkola ya PAYPI n’enkola ya PAYPI eyeetaagisa okukola ekirungo kya MDI era PHIPI y’enkola y’okukola (polyamine) efaananako n’ezo eza MDA {16} ekirungo kya PHDI ekyetaagisa okukola ekirungo kya MDI era nga kikolebwa mu nkola ya PALII era nga kikolebwa mu nkola ya PALII era nga kikolebwa mu nkola ya PALII era nga kikolebwa mu nkola ya PALII (polymine) (Proyound) (productions). Erimu 60% ku 75% diamine, era ekisumuluzo era kituukibwako nga tukyusa omugerageranyo gw’omuwendo gwa aniline ne formaldehyde charged ebintu. nga omugerageranyo gw’omuwendo gwa aniline/formaldehyde ekintu kiri 4/1.4, synthesized polyamine bweri nga 75% ya diamine ekirungo kya diamine. Ebiseera ebisinga, enkola ya co-production ya MDI ne PAPI etwalibwa.