Chemistry of inorganic compounds – Oxygen or compound thereof – Peroxide
Patent
1996-10-15
1998-10-27
Langel, Wayne
Chemistry of inorganic compounds
Oxygen or compound thereof
Peroxide
422211, 423589, 423590, C01B 15023
Patent
active
058274936
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for producing hydrogen peroxide according to the technique of autooxidation of an anthraquinone derivative, of the type including: solution containing at least one anthraquinone derivative in solution in at least one organic solvent; oxidation, in an oxidizer, of this hydrogenated working solution, by means of a fluid containing oxygen, especially by means of air; peroxide and of the oxidized working solution; and solution is recovered in stage (c).
In what follows, the pressures shown are relative pressures (or overpressures).
BACKGROUND OF THE INVENTION
A process as described above is conventionally carried out in plants intended for the production of commercial hydrogen peroxide solutions. For economic reasons (cf. Process Economic Report No. 68B, Hydrogen Peroxide, Marc 1992, chapter VI, SRI International) essentially linked with transportation and storage costs, these solutions must have a hydrogen peroxide concentration which is as high as possible, that is a concentration higher than 35%, more generally a concentration of 60% or 70% by weight.
With a view to preparing these concentrated, commercial hydrogen peroxide solutions the procedure is such as to recover at the exit of the extractor (stage (c)) a solution which has a hydrogen peroxide concentration that is as high as possible, while remaining outside the explosiveness region of the mixtures of working solutions and aqueous hydrogen peroxide solutions. In this context, patent application FR-A-2 228 717 shows that the hydrogen peroxide concentration of the said aqueous solution leaving the extractor must not be higher than 600 g/l, that is 50% by weight of hydrogen peroxide. A hydrogen peroxide concentration higher than this value is described as being capable of causing explosive reactions.
To obtain highly concentrated aqueous hydrogen peroxide solutions the operational parameters of the abovementioned autooxidation process are adapted so as to permit the use of a working solution which has a hydrogen peroxide equivalent that is as high as possible, for example a hydrogen peroxide equivalent higher than 11 g/l, or even more. Thus, patent application FR-A-2 086 166 recommends the use of a working solution capable of producing, after oxidation, a quantity of hydrogen peroxide of the order of 16 g/liter of working solution. However, such a conventional process using a high hydrogen peroxide equivalent has numerous disadvantages. Thus, this conventional process generally requires the use of high hydrogenation (stage (a)) and oxidation (stage (b)) temperatures. In this context, reference may be made to "Techniques de l'Ingenieur, "Hydrogen peroxide" chapter!, J 6 020, which mentions that the hydrogenation and oxidation temperatures must be between 60.degree. and 80.degree. C.
Another disadvantage encountered by the use of the said conventional process is that the working solution is rapidly degraded.
In addition, this conventional process is very sensitive to the presence of water, even in small quantity, which can be introduced accidentally either into the oxidizer or into the lines connecting the oxidizer and the extractor. In this region water reacts with the oxidized working solution, and this can cause explosive reactions.
OBJECT OF THE INVENTION
The objective of the present invention is to forestall the abovementioned disadvantages.
More particularly the objective of the invention is to provide a process for producing hydrogen peroxide according to the autooxidation technique including the stages (a) to (d) described above, which is particularly well suited from the viewpoint of the investment, of the operating cost and of safety, in real industrial conditions, to the on-site production of hydrogen peroxide that can be employed directly in some consumer plants such as the plants for the manufacture of paper pulp.
SUMMARY OF THE INVENTION
To this end the subject of the invention is a process of the above-mentioned type, characterized in that: the oxidizer a hydrogen p
REFERENCES:
patent: 2902347 (1959-09-01), Cosby et al.
patent: 2995424 (1961-08-01), Farrell
patent: 3880596 (1975-04-01), Liebert et al.
patent: 3952089 (1976-04-01), Kabisch et al.
patent: 4485084 (1984-11-01), McIntyre
patent: 4526757 (1985-07-01), Gupta
patent: 4539196 (1985-09-01), Sethl et al.
patent: 4541997 (1985-09-01), Bengt
patent: 4606905 (1986-08-01), Thirion
Chemoxal S.A.
Langel Wayne
LandOfFree
Process for producing hydrogen peroxide does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing hydrogen peroxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing hydrogen peroxide will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1611869