N'ozuzu, na njikọ nkehydroxypropyl methylcellulose, A na-emeso cellulose owu a nụchara anụcha na ngwọta alkali na 35-40 ° C maka ọkara otu awa, squeezed, cellulose na-egweri, ma mee agadi na 35 Celsius C, nke mere na eriri alkali enwetara bụ nkezi polymerized ogo dị n'ime oke achọrọ. Tinye eriri alkali n'ime kettle etherification, tinye propylene oxide na methyl chloride n'aka nke ya, wee tinye ya na 50-80 ℃ maka awa 5 na nrụgide dị elu nke ihe dịka 1.8 MPa. Mgbe ahụ tinye ego kwesịrị ekwesị nke hydrochloric acid na oxalic acid na mmiri ọkụ na 90 Celsius C iji sachaa ihe iji gbasaa olu. Wepu mmiri site na centrifuge. Na-asa ahụ ruo na-anọpụ iche, mgbe mmiri dị n'ime ihe na-erughị 60%, kpoo ya na ikuku na-ekpo ọkụ na 130 ° C na-erughị 5%.
Alkalization: The powdered nụchara anụcha owu mgbe oghere na-agbakwunyere n'ime ihe inert mgbaze, na-arụ ọrụ na alkali na rọrọ mmiri zasa kristal lattice nke nụchara anụcha owu, nke bụ conducive na penetration nke etherifying gị n'ụlọnga ụmụ irighiri na mma uniformity nke etherification mmeghachi omume. A na-eji alkali eme ihe na alkalization bụ metal hydroxide ma ọ bụ ntọala organic. Ọnụ ego nke alkali agbakwunyere (site na uka, otu n'okpuru) bụ 0.1-0.6 ugboro nke owu a nụchara anụcha, na mmiri dị nro bụ 0.3-1.0 ugboro nke owu a nụchara anụcha; ihe mgbaze inert bụ ngwakọta nke mmanya na-aba n'anya na hydrocarbon, na ọnụọgụ nke inert ihe mgbaze agbakwunyere bụ owu a nụchara anụcha. 7-15 ugboro: ihe mgbaze inert nwekwara ike ịbụ mmanya nwere 3-5 carbon atom (dị ka mmanya, propanol), acetone. Ọ nwekwara ike ịbụ aliphatic hydrocarbons na aromatic hydrocarbons; Ekwesịrị ịchịkwa okpomọkụ n'ime 0-35 ° C n'oge alkalization; oge alkalization bụ ihe dịka 1hr. Enwere ike ikpebi ngbanwe nke okpomọkụ na oge dịka ihe achọrọ nke ihe na ngwaahịa.
Etherification: Mgbe ọgwụgwọ alkalization gasịrị, n'okpuru ọnọdụ oghere, a na-eme etherification site n'ịgbakwunye onye na-emepụta ihe na-emepụta ihe, na onye na-emepụta ihe bụ propylene oxide. Iji belata oriri nke onye na-emepụta ihe na-emepụta ihe, a na-agbakwunye onye na-emepụta ihe ugboro abụọ n'oge usoro etherification.
Oge nzipu: Eprel-28-2024