ECF elemental chlorine-free bleaching kaʻina no ka ʻohe

He moʻolelo lōʻihi ko mākou o ka hana pepa ʻohe ma Kina. He mea kūikawā ka morphology fiber a me ka haku melemele. He lōʻihi ka lōʻihi o ka fiber, a he mea kūikawā ka microstructure cell fiber. He maikaʻi ka hana hoʻomohala ikaika i ka wā o ka pulping, e hāʻawi ana i ka pulp bleached i nā waiwai optical opacity kiʻekiʻe a me ka coefficient scattering māmā. He kiʻekiʻe ka ʻike o ka lignin o nā kumulāʻau ʻohe (e pili ana i 23% -32%), kahi e hoʻoholo ai i ka nui o ka alkali a me ka degere sulfidation i ka wā pulping a me ka kuke ʻana (ʻo ka nui o ka sulfidation he 20% -25%), kahi kokoke i ka lāʻau coniferous. . ʻO ke kiʻekiʻe o ka hemicellulose a me ka silicon content o nā mea maka ke lawe mai nei i kekahi mau pilikia i ka hana maʻamau o ka holoi ʻana i ka pulp a me ka hoʻoheheʻe ʻana i ka waiʻona ʻeleʻele a me ka ʻōnaehana lako. ʻOiai naʻe, ʻo nā mea maka o ka ʻohe he mea maikaʻi no ka hana pepa.

ʻO ka ʻōnaehana hoʻomaʻemaʻe o nā mea kanu pulping kemika nui a me ka nui o ka ʻohe e hoʻohana pono i ke kaʻina bleaching TCF a i ʻole ECF. ʻO ka ʻōlelo maʻamau, hui pū ʻia me ka delignification hohonu a me ka deligification oxygen o pulping, hoʻohana ʻia ka ʻenehana bleaching TCF a i ʻole ECF. Ma muli o ka helu o nā pae bleaching, hiki ke bleached ka pulp ʻohe i 88% -90% kukui.

Hoʻomaʻemaʻe ʻia kā mākou mau ʻiʻo pulp ʻohe bleached me ECF (elemental chlorine free), ʻoi aku ka liʻiliʻi o ka bleaching pohō ma ka pulp bamboo a me ka viscosity pulp kiʻekiʻe, ʻoi aku ka nui ma mua o 800ml/g. ʻOi aku ka maikaʻi o ka pulp ʻoi aku ka maikaʻi o ka pulp bleached ECF, hoʻohana i nā kemika liʻiliʻi, a ʻoi aku ka maikaʻi o ka bleaching. I ka manawa like, ua oʻo ka ʻōnaehana lako a paʻa ka hana hana.

ʻO nā kaʻina hana o ka ECF elemental chlorine-free bleaching o nā ʻiʻo ʻohe: ʻo ka mua, hoʻokomo ʻia ka oxygen (02) i loko o ka hale kiaʻi oxidation no ka delignification oxidative, a laila lawe ʻia ʻo D0 bleaching-washing-Eop extraction-washing-D1 bleaching-holoi. ma ke kaʻina ma hope o ka holoi ʻana. ʻO nā mea hoʻomaʻemaʻe kemika nui ʻo CI02 (chlorine dioxide), NaOH (sodium hydroxide), H202 (hydrogen peroxide), etc. ʻO ka hope, ua hana ʻia ka pulp bleached e ka dehydration kaomi. ʻO ka keʻokeʻo o ka ʻiʻo pulp ʻohe bleached hiki ke piʻi ma mua o 80%.