FIELD: chemistry.
SUBSTANCE: present invention relates to a hydroisomerisation catalyst, a method of producing said catalyst, a method for dewaxing hydrocarbon oil and a method of producing lubricant base oil. Described is a hydroisomerisation catalyst, obtained by calcining a catalyst composition containing an ion-exchanged molecular sieve or a calcined product thereof, wherein the ion-exchanged molecular sieve is obtained by ion-exchanging a molecular sieve in a solution which contains cationic groups, the molecular sieve includes nanocrystals having a pore structure of decahedral rings or octahedral rings and having a ratio of the pore volume to the external surface area ([pore volume]/[external surface area]) from 2.0×10-4 ml/m2 to 8.0×10-4 ml/m2, and contains an organic matrix and at least one metal selected from a group consisting of metals of Groups 8 to 10 of the Periodic Table of the elements, molybdenum and tungsten, deposited on the ion-exchanged molecular sieve or the calcined product thereof. Described is a method of producing the catalyst, involving a step (a) of hydrothermally synthesising a molecular sieve comprising nanocrystals having characteristics given above and an organic matrix; a step (b) of ion-exchanging the molecular sieve comprising an organic matrix in a solution containing a cationic groups to obtain an ion-exchanged molecular sieve; a step (c) of making the ion-exchanged molecular sieve or a calcined product thereof, carrying at least one metal selected from a group consisting of metals of Groups 8 to 10 of the Periodic Table of the elements, molybdenum and tungsten to obtain a catalyst composition; and a step (d) of calcining the catalyst composition. Described is a method of dewaxing hydrocarbon oil, involving bringing the hydrocarbon oil containing normal paraffins having 10 or more carbon atoms into contact with catalyst described above in the presence of hydrogen to convert a part of or all of the normal paraffins into isoparaffins. Described is a method of producing lubricant base oil in conditions for conversion of normal paraffins of substantially 100 wt %, the conversion being defined by the formula (1): conversion of normal paraffins (%)=[1-(total wt % of normal paraffins having Cn or more carbon atoms contained in mineral oil after contact)/(total wt % of normal paraffins having Cn or more carbon atoms contained in mineral oil before contact)]×100, where Cn denotes the minimum number of carbon atoms in normal paraffins having 10 or more carbon atoms contained in mineral oil before contact.
EFFECT: obtaining a catalyst with high isomerisation selectivity, stable and high output of hydrocarbon oils, suitable for lubricant base oils.
14 cl, 1 tbl, 8 ex, 2 dwg
