Method of producing cellulose carbamate
    2.
    发明授权
    Method of producing cellulose carbamate 失效
    生产氨基甲酸纤维素的方法

    公开(公告)号:US4567255A

    公开(公告)日:1986-01-28

    申请号:US710689

    申请日:1985-03-12

    IPC分类号: C08B15/06

    CPC分类号: C08B15/06

    摘要: The invention is directed to a procedure for manufacturing cellulose carbamate by reacting isocyanic acid and cellulose at elevated temperature. In the procedure, cellulose, to which biuret or a mixture of biuret and urea has been admixed or absorbed, is heated at a temperature over 170.degree. C. for a sufficient time to produce a quantity of isocyanic acid sufficient for formation of the cellulose carbamate and for accomplishing the reaction between cellulose and isocyanic acid. The heating is accomplished at 170.degree.-250.degree. C., preferably at about 220.degree. C. The biuret quantity is 3-50% by weight of the cellulose weight and the urea quantity is 0-95% by weight of the cellulose weight.

    摘要翻译: 本发明涉及通过异氰酸和纤维素在升高的温度下反应制备纤维素氨基甲酸酯的方法。 在该方法中,已经将缩二脲或缩二脲和脲的混合物混合或吸收的纤维素在170℃以上的温度下加热足够的时间以产生足以形成氨基甲酸纤维素的量的异氰酸酯 并用于完成纤维素和异氰酸之间的反应。 加热在170°-250℃,优选约220℃下进行。缩二脲的量为纤维素重量的3-50重量%,尿素的量为纤维素重量的0-95重量%。

    Cyclic process for producing an alkali solution of cellulose carbamate
and precipitating the carbamate
    3.
    发明授权
    Cyclic process for producing an alkali solution of cellulose carbamate and precipitating the carbamate 失效
    制备氨基甲酸纤维素碱溶液并沉淀氨基甲酸酯的循环方法

    公开(公告)号:US4639515A

    公开(公告)日:1987-01-27

    申请号:US779798

    申请日:1985-09-24

    摘要: The present invention concerns a cyclic process for producing an alkali aqueous solution of cellulose carbamate, for precipitating the cellulose carbamate from the alkali solution and for recovering and recycling the remaining chemicals. The process comprises the following steps: (a) an alkali solution of cellulose carbamate is prepared by dissolving cellulose carbamate in an aqueous solution of sodium hydroxide, (b) the solution obtained in step (a) is contacted with a precipitation aqueous solution containing sodium carbonate, whereby the cellulose carbamate is precipitated and can be removed, (c) from the solution in step (b) sodium carbonate is crystallized and is returned to the precipitant solution in step (b), and (d) mother liquor containing sodium hydroxide, obtained, i.e. remaining from, step (c), is returned to step (a) for dissolving cellulose carbamate. The crystallizing in step (c) is accomplished in two or several steps by cooling.

    摘要翻译: 本发明涉及一种制备氨基甲酸纤维素的碱性水溶液的循环方法,用于使碱性溶液中的氨基甲酸纤维素沉淀并回收和循环剩余的化学物质。 该方法包括以下步骤:(a)通过将氨基甲酸纤维素溶解在氢氧化钠水溶液中制备氨基甲酸纤维素的碱溶液,(b)将步骤(a)中得到的溶液与含有钠的沉淀水溶液接触 碳酸盐,由此氨基甲酸纤维素被沉淀并可以除去,(c)从步骤(b)中的溶液中,碳酸钠结晶并在步骤(b)中返回沉淀剂溶液,和(d)含有氢氧化钠的母液 从步骤(c)获得的剩余物质返回步骤(a),以溶解纤维素氨基甲酸酯。 步骤(c)中的结晶通过冷却两个或几个步骤完成。

    Cyclic process for producing an alkali solution of cellulose carbamate
and precipitating the carbamate
    7.
    发明授权
    Cyclic process for producing an alkali solution of cellulose carbamate and precipitating the carbamate 失效
    制备氨基甲酸纤维素碱溶液并沉淀氨基甲酸酯的循环方法

    公开(公告)号:US4639514A

    公开(公告)日:1987-01-27

    申请号:US779702

    申请日:1985-09-24

    CPC分类号: C08B3/14 C08B15/06 D01F2/24

    摘要: The present invention concerns a cyclic process for producing an alkali solution of cellulose carbamate, for precipitating the cellulose carbamate from the alkali solution and for recovering and recycling the chemicals. The process comprises the following steps: (a) an alkali solution of cellulose carbamate is prepared by dissolving cellulose carbamate in an aqueous solution of sodium hydroxide, (b) the solution obtained in step (a) is extruded into contact with a precipitating solution containing sodium carbonate, whereby the cellulose carbamate is precipitated and can be separated from the solution, (c) into the solution obtained in step (b) carbon dioxide is conducted for transforming the sodium hydroxide into sodium carbonate, (d) the solution obtained in step (c) is treated with calcium oxide, whereby the sodium carbonate is transformed into sodium hydroxide, and calcium carbonate precipitates from the solution, (e) solution containing sodium hydroxide obtained in step (d) is returned to step (a) for dissolving cellulose carbamate, and (f) calcium carbonate obtained in step (d) is decomposed into carbon dioxide and calcium oxide and the calcium oxide is returned to step (d).

    摘要翻译: 本发明涉及一种制备纤维素氨基甲酸酯碱性溶液的循环方法,用于使碱性溶液中的氨基甲酸纤维素沉淀并回收和再循环化学品。 该方法包括以下步骤:(a)通过将氨基甲酸纤维素溶解在氢氧化钠水溶液中制备氨基甲酸纤维素的碱溶液,(b)将步骤(a)中得到的溶液挤出与含有 碳酸钠,由此使氨基甲酸纤维素沉淀并且可以从溶液中分离出来,(c)在步骤(b)中获得的溶液中进行二氧化碳,以将氢氧化钠转化为碳酸钠,(d)步骤 (c)用氧化钙处理,碳酸钠转化为氢氧化钠,碳酸钙从溶液中析出,(e)将步骤(d)中得到的含氢氧化钠的溶液返回步骤(a) 和(f)步骤(d)中得到的碳酸钙分解成二氧化碳和氧化钙,氧化钙返回步骤(d)。

    Melt-spun high-strength polyethylene fibre
    8.
    发明授权
    Melt-spun high-strength polyethylene fibre 失效
    熔纺高强度聚乙烯纤维

    公开(公告)号:US5474845A

    公开(公告)日:1995-12-12

    申请号:US343483

    申请日:1994-12-16

    IPC分类号: D01F6/04 D02G3/00

    摘要: The invention concerns a high strength polyethylene fibre, which is prepared by melt spinning polyethylene having a high density through a spinnerette, by cooling the fibre coming out from the spinnerette and by stretching the fibre obtained at 50.degree.-150.degree. C. The polyethylene used in the melt spinning is a homopolymer of ethylene having a weight average molecular weight M.sub.w between 125000-175000 g/mol, a number average molecular weight M.sub.n between 26000-33000 g/mol, polydispersity (M.sub.w /M.sub.n) below 5 and the density higher than 955 g/dm.sup.3. The stretching degree in the drawing step is at least 400%.

    摘要翻译: PCT No.PCT / FI93 / 00230 Sec。 371日期1994年12月16日第 102(e)日期1994年12月16日PCT提交1993年5月28日PCT公布。 公开号WO93 / 24686 日本1993年12月9日。本发明涉及一种高强度聚乙烯纤维,其通过将通过喷丝板高密度熔融纺丝的聚乙烯制成,通过冷却从纺丝板出来的纤维,并通过拉伸50- 用于熔融纺丝的聚乙烯是重均分子量Mw为125000-175000g / mol,数均分子量Mn为26000-33000g / mol之间的乙烯均聚物,多分散性(Mw / Mn ),密度高于955g / dm3。 拉伸步骤中的拉伸度为至少400%。

    Process for the preparation of viscose
    9.
    发明授权
    Process for the preparation of viscose 失效
    粘胶制备工艺

    公开(公告)号:US4210747A

    公开(公告)日:1980-07-01

    申请号:US930917

    申请日:1978-08-04

    IPC分类号: C08B1/08 C08B9/00 D21C9/00

    CPC分类号: C08B1/08

    摘要: A process for the preparation of viscose by adding to cellulose pulp, manufactured by alkali cooking without prehydrolysis or by acid cooking without alkali extraction, steeping lye and an organic compound, steeping the pulp to form alkali cellulose, aging the alkali cellulose, xanthating the aged alkali cellulose with carbon disulfide to obtain cellulose xanthate and dissolving the cellulose xanthate to obtain viscose.

    摘要翻译: 通过添加到纤维素纸浆中制备粘胶的方法,其通过碱蒸煮而不经过预水解或通过酸性蒸煮而无碱萃取,浸渍碱液和有机化合物,浸渍纸浆形成碱纤维素,老化碱纤维素,老化黄原酸 碱性纤维素与二硫化碳一起得到黄原酸纤维素,并溶解黄原酸纤维素以获得粘胶。