ECF elemental chlorine-isina bleaching process ye bamboo tissue

Tine nhoroondo refu ye bamboo papermaking muChina. Bamboo fiber morphology uye chimiro chemakemikari zvakakosha. Ivhareji yehurefu hwefiber yakareba, uye iyo fiber cell wall microstructure yakakosha. Iko simba rekusimudzira kuita panguva yekupuruzira yakanaka, ichipa iyo yakasvibiswa pulp yakanaka yekuona zvimiro zvepamusoro opacity uye mwenje wekuparadzira coefficient. Iyo lignin yemukati ye bamboo raw materials (inenge 23% -32%) yakakwira, iyo inotaridza iyo yakakwira alkali huwandu uye sulfidation degree panguva yekupuruzira nekubika (iyo sulfidation degree inowanzo 20% -25%), iri padyo ne coniferous huni. . Iyo yakakwira hemicellulose uye silicon yemukati yezvinhu zvakasvibirira zvakare inounza mamwe matambudziko kune yakajairika mashandiro ekugezesa pulp uye dema doro evaporation uye yevasungwa michina system. Pasinei neizvi, bamboo raw materials ichiri yakanaka mbishi zvinhu zvekugadzira mapepa.

Iyo bleaching system yemahombe uye epakati-saizi makemikari pulping zvirimwa zve bamboo inozotora TCF kana ECF bleaching process. Kazhinji kutaura, yakasanganiswa neyakadzama delignification uye oxygen delignification yekupuruzira, TCF kana ECF bleaching tekinoroji inoshandiswa. Zvichienderana nehuwandu hwematanho eku bleaching, bamboo pulp inogona kucheneswa kusvika 88% -90% kupenya.

Matishu edu akacheneswa eshenjere pulp tissues ese akacheneswa neECF (elemental chlorine free), iyo ine kushomeka kusara kwe bleaching pabamboo pulp uye yakakwirira pulp viscosity, kazhinji inosvika kupfuura 800ml/g. ECF yakacheneswa bamboo matishu ane nani pulp mhando, anoshandisa mashoma makemikari, uye ane yakanyanya kuchena. Panguva imwecheteyo, hurongwa hwekushandisa hwakakura uye kushanda kwekushanda kwakagadzikana.

Matanho eECF elemental chlorine-isina bleaching ye bamboo tissues ndeiyi: kutanga, oxygen (02) inounzwa muoxidation tower for oxidative delignification, uyezve D0 bleaching-washing-Eop extraction-washing-D1 bleaching-washing inoitwa. mukutevedzana mushure mekugeza. Iyo huru yemakemikari bleaching agents ndeye CI02 (chlorine dioxide), NaOH (sodium hydroxide), H202 (hydrogen peroxide), etc. Pakupedzisira, iyo bleached pulp inoumbwa nekudzvinyirira kupera mvura. Kuchena kweakacheneswa bamboo pulp tissue kunogona kusvika kudarika 80%.