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    • 4. 发明授权
    • Process for preparing methacrylic acid
    • 制备甲基丙烯酸的方法
    • US4564703A
    • 1986-01-14
    • US30647
    • 1979-04-16
    • Haruhisa YamamotoShinichi Akiyama
    • Haruhisa YamamotoShinichi Akiyama
    • C07C51/00C07C51/25C07C51/48C07C57/055C07C67/00
    • C07C51/252C07C51/48
    • In a process for preparing methacrylic acid by the vapor-phase catalytic oxidation of methacrolein or a methacrolein-containing mixture with molecular oxygen in the presence of an oxidation catalyst; the improvement wherein said process comprisesa first-stage oxidation step of oxidizing methacrolein or a methacrolein-containing mixture as a starting material,a first-stage separating step of separating the resulting methacrylic acid from the reaction product obtained in the first-stage oxidation step,a second-stage oxidation step of oxidizing the mixture containing the unreacted methacrolein and obtained in the first-stage separating step, anda second-stage separating step of separating the resulting methacrylic acid from the reaction product obtained in the second-stage oxidation step, andwith or without at least one additional oxidation step and separating step subsequent to the second-stage separating step,and wherein the conversion of methacrolein in the first-stage oxidation step is adjusted to 30-85 mole % and the final conversion of methacrolein is adjusted to at least 90 mole %.
    • 在氧化催化剂存在下,通过气相催化氧化甲基丙烯醛或含有异丁烯醛的混合物与分子氧制备甲基丙烯酸的方法; 改进之处在于,所述方法包括氧化异丁烯醛或含异丁烯醛的混合物作为原料的第一阶段氧化步骤,从第一阶段氧化步骤获得的反应产物中分离得到的甲基丙烯酸的第一阶段分离步骤 在第一阶段分离工序中氧化含有未反应的甲基丙烯醛的混合物的第二阶段氧化步骤和从后段氧化步骤得到的反应产物中分离得到的甲基丙烯酸的第二阶段分离步骤 ,并且在第二阶段分离步骤之后有或没有至少一个额外的氧化步骤和分离步骤,并且其中将第一阶段氧化步骤中的甲基丙烯醛的转化率调节至30-85摩尔%,并且甲基丙烯醛的最终转化率 调节至至少90摩尔%。
    • 8. 发明授权
    • Oxidation of olefins
    • 烯烃的氧化
    • US4186152A
    • 1980-01-29
    • US821315
    • 1977-08-02
    • Haruhisa YamamotoShinichi Akiyama
    • Haruhisa YamamotoShinichi Akiyama
    • C07C27/14B01J23/88B01J23/89B01J27/198B01J27/199B01J37/02C07B61/00C07C27/00C07C45/00C07C45/35C07C47/22C07C51/00C07C57/055C07C67/00C07C45/04
    • B01J23/887B01J23/8993B01J37/0236C07C45/35B01J2523/00
    • A catalyst for oxidation of olefins which has a composition of the general formulaMo.sub.a Bi.sub.b Fe.sub.c Co.sub.d Ni.sub.e Be.sub.f Q.sub.g R.sub.h X.sub.i O.sub.jwherein Q is at least one element selected from K, Rb, Cs and Tl; R is at least one element selected from P, As and B; X is at least one element selected from Ce, Ti, Te, Zn, Ge, Sn, Cr, Ga, La, In, Al, Cd, Pd, Mn, V, Pb, Nb, Ag, Zr, Cu, Nd and U; a, b, c, d, e, f, g, h and i respectively represent the numbers of Mo, Bi, Fe, Co, Ni, Be, Q, R and X atoms, and when a is 12, b is 0.1-10, c is 0.5-40, d is 0-12, e is 0-12 with the proviso that the sum of d and e is 0.5-15, f is 0.1-35, g is 0.01-5, h is 0-5, i is 0-12; and j is the number of oxygen atoms which satisfies the atomic valences of the other elements.Unsaturated aldehydes can be prepared in a high selectivity and a high one-pass yield by oxidizing olefins containing 3 carbon atoms in the straight chain in the vapor phase in the presence of the aforesaid catalyst at a temperature of 250.degree. to 700.degree. C.
    • 用于烯烃氧化的催化剂,其具有通式为MoaBibFecCodNieBefQgRhXiOj的组成,其中Q为选自K,Rb,Cs和T1中的至少一种元素; R是选自P,As和B中的至少一种元素; X是选自Ce,Ti,Te,Zn,Ge,Sn,Cr,Ga,La,In,Al,Cd,Pd,Mn,V,Pb,Nb,Ag,Zr,Cu,Nd中的至少一种元素, U; a,b,c,d,e,f,g,h和i分别表示Mo,Bi,Fe,Co,Ni,Be,Q,R和X原子的数,当a为12时,b为0.1 -10,c为0.5-40,d为0-12,e为0-12,条件是d和e的和为0.5-15,f为0.1-35,g为0.01-5,h为0 -5,我是0-12; 并且j是满足其它元素的原子价的氧原子数。 在上述催化剂存在下,在250〜700℃的温度下,通过在蒸气相中在直链中含有3个碳原子的烯烃进行氧化,可以高选择性和高一次收率制备不饱和醛。