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    Preparation of urea in combination with the synthesis of ammonia
    471.
    发明授权
    Preparation of urea in combination with the synthesis of ammonia 失效
    尿素与氨基酸合成的组合制备

    公开(公告)号：US3647872A

    公开(公告)日：1972-03-07

    申请号：US3647872D

    申请日：1968-12-23

    Applicant: STAMICARBON

    Inventor： KAASENBROOD PETRUS J C ,  TAKS GERARDUS J J M

    IPC: C01C1/04 ,  C07C273/10 ,  C07C127/00

    CPC classification number: C07C273/10 ,  C01C1/0488 ,  Y02P20/52

    Abstract: A PROCESS FOR THE MANUFACTURE OF UREA FROM AMMONIA AND CARBON DIOXIDE IS DESCRIBED WHEREIN A TECHNIQUE FOR REDUCING THE AMOUNT OF INERT GASES SUPPLIED TO UREA REACTOR IS UTILIZED. THIS TECHNIQUE INVOLVES FIRST ABSORBING THE AMMONIA FROM THE AMMONIA SYNTHESIS GAS MIXTURE (CONTAINING AMMONIA, HYDROGEN AND NITROGEN) IN A SUITABLE SOLVENT (WATER, OR AN AQUEOUS SOLUTION IN WHICH AMMONIA IS READILY ABSORBED), AND THEREAFTER DESORBING THE AMMONIA IS READILY ABSORBED), AND THEREAFTER DESORBING THE AMMONIA CONTENT OF THE ABSORBENT SOLUTION IN A SUITABLE GAS STREAM, THE DESORPTION BEING CONDUCTED IN SUCH A WAY THAT THE AMMONIA CONTENT OF THE DESORBED GAS MIXTURE IS MAINTAINED SUFFICIENTLY HIGH THAT A RELATIVELY MUCH SMALLER VOLUME OF INERT GASES ARE THEREBY INTRODUCED INTO THE UREA SYNTHESIS REACTOR.

    Preparing ferrous salt solutions
    473.
    发明授权
    Preparing ferrous salt solutions 失效
    制备富含盐的溶液

    公开(公告)号：US3616327A

    公开(公告)日：1971-10-26

    申请号：US3616327D

    申请日：1969-11-10

    Applicant: STAMICARBON

    Inventor： BARENDRECHT EMBRECHT ,  GEUS JOHN W

    IPC: C25B1/00 ,  C01G49/10 ,  B01K1/00

    CPC classification number: C25B1/00

    Abstract: Ferrous salt solutions are produced by contacting an aqueous iron salt solution in a reaction vessel with two electrodes, one of which consisting of a layer of mercury and the other of a hydrogen electrode, consisting of a noble-metal conductor along and around which a stream of hydrogen is passed, the two electrodes being connected by means of an electric conductor.

    Apparatus for measuring the refractive index of a solution in rotating centrifuge cells
    474.
    发明授权
    Apparatus for measuring the refractive index of a solution in rotating centrifuge cells 失效
    用于测量旋转中心细胞中解决方案的折射率的装置

    公开(公告)号：US3615140A

    公开(公告)日：1971-10-26

    申请号：US3615140D

    申请日：1969-11-07

    Applicant: STAMICARBON

    Inventor： DOORNEKAMP JOHAN G F ,  SIESWERDA BAUKE S

    IPC: G01P3/486 ,  H02P5/52 ,  G01N21/24

    CPC classification number: G01P3/486 ,  H02P5/56

    Abstract: AN APPARATUS FOR MEASURING THE REFRACTIVE INDEX OF A SOLUTION IN A ROTATING CENTRIFUGE PROVIDED WITH A MULTICELL ROTOR AND WITH A SELECTOR CIRCUIT FOR OBSERVING A GIVEN CELL WITH APPLICATION OF A LIGHT SOURCE CONTINUOUSLY OMITTING RADIATION AND A MOTOR-OPERATED ROTARY DISC, SERVING AS A GATE, WHOSE SPEED OF REVOLUTION IS DERIVED FROM THAT OF THE ROTOR, BOTH THE ROTOR AND THE DISC BEING EQUIPPED WITH MEANS FOR THE GENERATION OF PULSES WITH A FREQUENCY THAT IS DIRECTLY PROPORTIONAL TO THE NUMBER OF REVOLUTIONS AND WHEREIN USE IS MADE OF AN ELECTRONIC CONTROLLER WHICH FEEDS THE DISC DRIVE WITH PULSES OF A FREQUENCY EQUAL TO THAT OF THE ROTOR PULSES, UNLESS SAID MOTOR IS ROTATING AT TOO HIGH A SPEED, WHILE IN THE CASE OF A SYNCHRONOUS OR LAGGING SPEED OF REVOLUTION THE TIME DURATION OF THE PULSES TO BE FED TO THE MOTOR IS REDUCED BY THE PULSES GENERATED BY THE DISC IN SO FAR AS THE LATTER PULSES COME WITHIN THE TIME DURATION OF THE PULSES TO BE FED TO THE MOTOR, AND THE DISC IS COUPLED WITH A DAMPER FOR THE SUPPRESSION OF ROTATIONAL VIBRATIONS.

    Process of preparing lysine monohydrochloride
    476.
    发明授权
    Process of preparing lysine monohydrochloride 失效
    制备LYSINE MONOHYDROCHLORIDE的方法

    公开(公告)号：US3576859A

    公开(公告)日：1971-04-27

    申请号：US3576859D

    申请日：1968-11-22

    Applicant: STAMICARBON

    Inventor： NELEMANS JOHANNES E

    IPC: C07C20060101 ,  C07C99/06 ,  C07C99/12 ,  C07C101/24

    CPC classification number: C07C229/24

    Abstract: THERE IS PROVIDED A PROCESS FOR PREPARING LYSINE MONOHYDROCHLORIDE BY HYDROLYSIS OF A-AMINO-E-CAPROLACTAM WHEREIN THE HYDROLYSIS MIXTURE IS PASSED THROUGH AN ANION EXCHANGER TO REMOVE HC1 THEREFROM. THE HC1 BOUND TO THE ANION EXCHANGER IS REMOVED THEREFROM BY FORMATION OF A SALT WITH ADDITIONAL A-AMINO-E-CAPROLACTAM AND THE SALT IS THEN USED IN THE HYDROLYSIS STEP.

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