Your search within this document for 'sultan' resulted in three matching pages.
1

“...Republic; His Majesty the King of Italy; His Majesty the King of the Netherlands, Grand Duke of Luxemburg, etc.; His Majesty the Emperor of All the Russias; and His Majesty the Emperor of the Ottomans; wishing to establish, by a Conventional Act, a definite system destined to guarantee at all times, and for all the Powers, the free use of the Suez Maritime Canal, and thus to complete the system under which the navigation of this canal has been placed by the Firman of His Imperial Majesty the Sultan, dated the 22nd February, 1866 (2 Zilk&dé, 1282), and sanctioning the concessions of His Highness the Khedive, have named as their Plenipotentiaries, that is to say: — (Here follow the names.} Who, having communicated to each other their respective full powers, found in due and good form, have agreed upon the following articles:— Article I. The Suez Maritime Canal shall always be free and open, in time of war as in time of peace, to every vessel of commerce or of war, without distinction of flag...”
2

“...the 17th of March, 1885; and shall, if necessary, concert with them on the subject. The provisions of Articles IV., V., VII., and VIII. shall not interfere with the measures which shall be taken in virtue of the present article. Article X. Similarly the provisions of Articles IV., V., VII., and VIII. shall not interfere with the measures which His Majesty the Sultan and His Majesty the Khedive, in the name of His Imperial Majesty, and within the limits of the Firmans granted, might find it necessary to take for securing by their own forces the defence of Egypt and the maintenance of public order. In case His Imperial Majesty the Sultan, or His Highness...”
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“...free use of the canal, a principle which forms one of the bases of the present treaty, agree that none of them shall endeavour to obtain with respect to the canal territorial or commercial advantages or privileges in any international arrangements which may be concluded. Moreover, the rights of Turkey as the territorial power are reserved. Article XIII. With the exceptions of the obligations expressly provided by the clauses of the present treaty, the sovereign rights of His Imperial Majesty the Sultan, and the rights and immunities of His Highness the Khedive, resulting from the Firmans, are in no way affected. Article XIV. The high contracting parties agree that the engagements resulting from the present treaty shall not be limited by the duration of the acts of concession of the Universal Suez Canal Company. Article XV. The stipulations of the present treaty shall not interfere with the sanitary measures in Egypt. Article XVI. The high contracting parties agree to bring the present treaty...”