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1. 发明授权

KR860001615B1 회분식 다단침지 펄프와 공정 失效
公开(公告)号：KR860001615B1
公开(公告)日：1986-10-14
申请号：KR840004969
申请日：1984-08-17
申请人： BELOIT CORP
发明人： GRANT RALPH S
IPC分类号： D21C3/22 , D21C3/26

2. 发明专利

CA1229254A MULTI-STAGE PULP WASHING WITHIN A BATCH DIGESTER 未知
公开(公告)号：CA1229254A
公开(公告)日：1987-11-17
申请号：CA454546
申请日：1984-05-17
申请人： BELOIT CORP
发明人： GRANT RALPH S
IPC分类号： D21C9/02
摘要： A method for washing pulp in a batch digester modified pulping process wherein black cooking liquor used for cooking the chips is partially displaced by pumping a first stage wash effluent into the bottom of the digester, additional amounts of the cooking liquor are displaced by pumping a second stage wash effluent, and so on, until sufficient increments of wash effluent have been pumped to displace the cooking liquor. A wash filtrate water is then pumped into the digester from a final pulp washing operation to displace the hot black liquor until all of the hot black liquor is sent to an accumulator, and the various wash effluents have been replenished in their respective stages.

3. 发明专利

CA1255948A BATCH DIGESTER MULTI-STAGE PULPING PROCESS 未知
公开(公告)号：CA1255948A
公开(公告)日：1989-06-20
申请号：CA460156
申请日：1984-08-01
申请人： BELOIT CORP
发明人： GRANT RALPH S
IPC分类号： D21C3/22 , D21C3/26 , D21C7/00
摘要： The present invention relates to a multi-stage wood chip cooking process performed in a single digester in a batch type operation. The wood chips to be cooked are introduced into the digester and soaked with a warm black liquor to remove most of the air from the digester and the chips. This warm black liquor is thereafter displaced from the digester with a mixture of a first stage hot black liquor and hot white liquor, the proportionate amount of hot white liquor being relatively high. The temperature of the digester contents is then raised to a cooking temperature for a predetermined amount of time. The original cooking liquor is then displaced with a mixture of a second hot black liquor and hot white liquor, the proportionate amount of hot white liquor in this second cooking liquor being less than in the first, Again, the temperature of the digester is raised to a cooking temperature and the cooking is carried out for a shorter period of time than in the first cooking stage. After the required number of cooks which may be preferably three but may be as low as two or more than three, the cooking liquor is displaced from the digester with a liquid filtrate derived from pulp washing. Finally, the contents of the digester are emptied by applying gas under pressure to the interior of the digester.

4. 发明专利

PH23991A BATCH DIGESTER MULTI-STAGE PULPING PROCESS 未知
公开(公告)号：PH23991A
公开(公告)日：1990-02-09
申请号：PH31115
申请日：1984-08-17
申请人： BELOIT CORP
发明人： GRANT RALPH S
IPC分类号： D21C3/22 , D21C3/26 , D21C3/00 , D21C7/00
摘要： The multi-stage pulping process is performed in a single digester (10) in a batch type operation. The wood chips to be cooked are introduced into the digester (10) and soaked with a warm black liquor to remove most of the air from the digester (10) and the chips. This warm black liquor is thereafter displaced from the digester (10) with a mixture of a first stage hot black liquor and hot white liquor, the proportionate amount of hot white liquor being relatively high. The temperature of the digester contents is then raised to a cooking temperature for a predetermined amount of time. The original cooking liquor is then displaced with a mixture of a second hot black liquor and hot white liquor, the proportionate amount of hot white liquor in this second cooking liquor being less than in the first. Again, the temperature of the digester (10) is raised to a cooking temperature and the cooking is carried out for a shorter period of time than in the first cooking stage. After the required number of cooks which may be preferably three but may be as low as two or more than three, the cooking liquor is displaced from the digester with a liquid filtrate (47) derived from pulp washing. Finally, the contents of the digester (10) are emptied by applying gas under pressure to the interior of the digester (10).

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